. The Conchologists' exchange. Mollusks. TIIK NAUTILOS. 19 shining, the more recent whorls j)erhaj)s a little more rapidly in- creasing in size than the first three or four, the apex acute with the embryonic whorls two in number and very minute, the next three small and simple, the five succeeding similar to the preceding three except in possessing, at each side, a large obtuse aliform process as shown in the figure. Umbilicus rimate. Inner lip defined throughout by callus, which is slightly reflected along the umbilicus. Surface of all the whorls feebly and evenly convex, the suture fine and
. The Conchologists' exchange. Mollusks. TIIK NAUTILOS. 19 shining, the more recent whorls j)erhaj)s a little more rapidly in- creasing in size than the first three or four, the apex acute with the embryonic whorls two in number and very minute, the next three small and simple, the five succeeding similar to the preceding three except in possessing, at each side, a large obtuse aliform process as shown in the figure. Umbilicus rimate. Inner lip defined throughout by callus, which is slightly reflected along the umbilicus. Surface of all the whorls feebly and evenly convex, the suture fine and simple but distinct. Length mm. Lower Claiborne Eocene (St. Maurice, La.) The outer lip is broken away in the unique type, but undoubtedly possessed an aliform projection similar to that immediately above it. The processes are of the nature of thin varices which served to protect the animal, and the growth of the shell between these tem- .porary arrests was probably very rapid. THEEE NEW SPECIES OF CHROMODORIS. BY T. D. A. COCKERELL. The species here described are obviously different from C cali- fomiensisy Bergh, and C. agassizii, Bergh, and 1 do not find any descriptions applicable to them. Chromodoris universitatis, n. s[). Length about G7 mm., rather narrow, mantle less ample than in C. mcfarlandi, not ex- panded at the sides ; rhinophores and branchiae wholly retractile ; rhinophores stout, with numerous transverse lamellae ; branchiae of about 12 large simply pinnate plumes, several more or less branched, and so bipinnate at the ends; oral tentacles just concealed by mantle ; hind end of mantle gibbous ; foot projecting 20 mm. behind end of mantle ; breadth of sole when crawling 8J mm. Color rich dark ultramarine blue, the edge of the mantle and the edge of the foot bright cobalt blue ; rhinophores very dark blue ; mnntle with two longitudinal series of oblong very bright orange spots, about seven in a series ; five round orange spots on the anterior part of the mantl
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmollusks, bookyear188
