136 



GENUS CONCHODERMA. 



pointed ■ first tooth as far from the second, as is the latter 

 from the inferior angle ; in one specimen, on one side, 

 there were five teeth. 



Maxilla with three great spines at the upper angle, 

 beneath which a deep notch, and with the inferior part 

 much upraised ; this lower part rather rounded at both 

 corners, with the upper spines longer than the lower. 



Outer Maxilla with the bristles continuous in front ; 

 externally, slightly protuberant, with a tuft of bristles 

 longer than those on the front side. Olfactory orifices 

 apparently not protuberant ; but all the specimens were 

 in a bad state. 



Cirri. — Prosoma very little developed. First cirrus 

 very far removed from the second. The three posterior 

 cirri are straight and long ; the segments are elongated 

 and bear four or five pairs of very long spines, with a 

 single minute intermediate spine between each pair ; 

 dorsal tufts, with long spines. First cirrus, rami unequal 

 by two or three segments, and thickly covered with spines ; 

 the first cirrus is short compared to the second, owing to 

 the length of the pedicel of the latter, though the longer 

 ramus of the first, nearly equals the shorter ramus of the 

 second pair. Second cirrus, with its anterior ramus 

 shorter by two or three segments than the posterior 

 ramus, and thicker than it, with the segments covered like 

 brushes with bristles ; posterior ramus, and both rami of 

 the third cirrus, a little more thickly clothed with bristles 

 than are the three posterior cirri. 



Caudal Appendages, minute, broadly oval, with six or 

 seven long bristles on their summits. 



Genus — Conchoderma. Plate III. 



Conch oderma. Olfers. Magaz. der Gesellsch. Natuforsch. 

 Freunde zu Berlin, Drittes Quartel, 1814 * 



* The general title to the volume, containing four Quarterly parts, is 

 dated 1818 ; but as in the 'Journal dc Physique/ for July, 1817, the editor 



