. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Pacific Coast of North America. 179 25. Sphceronia ampUcaudaj Stimpson. SphcBroma amplicauda, Stimpson, Proc. Bost. Soc. Nat. Hist. vi. 1857, p. 89. Hah. Tomales Bay, California. Stebbing ^ suggests that a new genus near Cychidura may be required for this species. 26. Sphceroma rJwmhurum, sp. n. Surface of body punctate ; colour whitish yellow. Head small. First pair of antennae reach almost to the posterior margin of the thoracic segment. Second pair Fig- 12. of antenn
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Pacific Coast of North America. 179 25. Sphceronia ampUcaudaj Stimpson. SphcBroma amplicauda, Stimpson, Proc. Bost. Soc. Nat. Hist. vi. 1857, p. 89. Hah. Tomales Bay, California. Stebbing ^ suggests that a new genus near Cychidura may be required for this species. 26. Sphceroma rJwmhurum, sp. n. Surface of body punctate ; colour whitish yellow. Head small. First pair of antennae reach almost to the posterior margin of the thoracic segment. Second pair Fig- 12. of antenna extend quite to the posterior margin of the first thoracic segment. Eyes situated post-laterally. Thoracic segments equal in length. Epimera broad and short, extending downwards, Sphceroma rhomburum. x \^. forming an angle with the seg- Abdomen, ments. First abdominal segment as long as any of the thoracic segments, crossed by suture-lines and surmounted by two tubercles, close together, one on either side of the median line. Terminal segment with its extremity produced in a process rhomboid in shape and with sides infolded, forming a kind of funnel-like opening when seen from beneath. At the base of this segment are two tubercles, which are con- tinuous with two longitudinal ridges in the centre of the segment. These ridges unite near the extremity and con- tinue as one median ridge. The uropoda are shorter than the terminal segment; the outer branch is more lanceolate in shape ; both are of equal length. Two specimens were taken at Monterey Bay, California, by Mr. Heath. Type, No. 22573, N. M. This species is near S. egregium, Chilton t, fi'om Arakoa, but differs in the presence of two tubercles on the first abdominal segment, in the presence of two tubercles and two longitudinal ridges uniting in a single ridge on the terminal segment, and in the equality in length of the two branches of the uropoda. * Hist. Crust. 1893, p. 364. t Trans. New Zealand Inst. xxiv. 1891,
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