. Bulletin - United States National Museum. Science. 116 BULLETIN 93^ UNITED STATES NATIONAL MUSEUM. The radii vary in width, but have obhque summits, so that the orifice, especially in the more tubular examples, is toothed. The 'parietal tubes are very numerous, 29 in the rostrum, and are pro- vided with many transverse septa throughout their length. The interior is ribbed only very close to the base. The sheath is colored hke the outside. The base is porous, but often iiTegularly, large parts of it being poreless. Darwin states that there are no pores m a South African specimen he examined.
. Bulletin - United States National Museum. Science. 116 BULLETIN 93^ UNITED STATES NATIONAL MUSEUM. The radii vary in width, but have obhque summits, so that the orifice, especially in the more tubular examples, is toothed. The 'parietal tubes are very numerous, 29 in the rostrum, and are pro- vided with many transverse septa throughout their length. The interior is ribbed only very close to the base. The sheath is colored hke the outside. The base is porous, but often iiTegularly, large parts of it being poreless. Darwin states that there are no pores m a South African specimen he examined. Greatest diameter 20 mm.; height 10 mm. (conic). Greatest diameter 17 mm.; height 15 mm. (conic). Greatest diameter 16 mm.; height 18 mm. (tubular). The labrum has three teeth on each side (fig. 29a).. Fig. 29.—BALANU3 spongicola, Exmouth. a, labkum. 6, uth segment of cirrus vi. C, ANTERIOR PART OF AN INTERMEDIATE SEGMENT OF CIRRUS IH. d, MAXILLA. The mandible is like that of B. concavus, figured on p. 106, fig. 26&. The maxillse (fig. 29c^) has eight spines between the upper and lower large paii-s. There is also an inserted spine between those of the lower pair, and another below them. The edge is rather even. Cirrus i has rami of 19 and 12 segments. The posterior ramus is about three-fifths as long as the anterior and has moderately pro- tuberant segments not nearly so long as in B. concavus. Cirrus ii has 14 and 15 segments, but the anterior ramus is a trifle longer. Cirrus iii has rami of 15 and 13 segments. On the anterior ramus the third to thirteenth segments are armed as shown in fig. 29c, but vary in the number of " ; The posterior ramus has the fourth to eighth segments similarly armed. I see no teeth on cirrus iv. Cim V and vi have most of the segments with three pairs of spines, but there are four pairs, the lower very small, on a few segments. The penis is extremely long, as in other species of this Please note that these images are ex
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