MORSE: OBSERVATIONS ON LAMELLIBRANCHS. 
183 
SOLECITRTUS GmBUS Conrad, 
rig. ;J7. Length, 90 mm. 
The mantle projects beyond the margin of the shell from the 
posterior end round to the dorsal anterior end, appearing first at 
the lower posterior corner and increasing in extent toward the 
anterior portion. The edge of the mantle is fringed with minute 
papillae becoming larger on the anterior border, and on the 
dorsal border somewhat bulbous and truncate (Fig. 37, a). 
These are closely crowded together. On the anterior ventral 
edge the papillae are short, broad at their base, pointed and 
tipped with dark brown or nearly black. They are irregularly 
Fig. 37. — Solecurtus gibbus Conrad. 
crowded and vary ever so slightly in length. Included within 
the space of the broad-based foot is an inner delicate fold of 
the mantle lined with minute papillae and at regular intervals 
shghtly longer papillae are seen (Fig. 37, 6). The foot is short 
with broad base and is probably capable of great extension. The 
first expanse of the mantle has its edge delicately folded. This 
is clothed with fine w^hite hairs on its surface and is smoke- 
colored. The second expanse of the mantle at the anterior 
ventral end is dark brown. I have never seen in other lamelli- 
branchs so diverse a set of papillae as here described. The 
