[55] 



DECAPODA FROM ALBATROSS DREDGINGS. 



399 



Amalopen^us blegans Smith. 



Bull. Mus. Comp. Zool., x, p. 87, pi. 14, figs. 8-14, pi. 15, figs. 1-5, 1882. 

 Specimens examined. 



The carapax is not at all compressed laterally, but about as broad as 

 high, thin and membranaceous, and its surface naked and polished. A 

 sharp dorsal carina extends the whole length, but is most conspicuous 

 in front of the gastric sulcus, rises in front into a sharp lamellar crest 

 armed with a single sharp tooth over the posterior margin of the orbit, 

 and projects forward in a short but acute and laterally compressed ros- 

 trum, which scarcely reaches the middle of the eye-stalks. 



The eye-stalks, including the eyes, are about a fourth as long as the 

 carapax. The stalks are slender, comi)ressed vertically, and bear a 

 slender but obtuse papilliform process about the middle of the inner 

 side, and just in front and outside of this there is a small spot of black 

 pigment showing more conspicuously above than below. The eyes 

 themselves are nearly round, scarcely as wide as the stalks, faceted, and 

 dark brown in the alcoholic specimens. 



The anteniial scale is a little more than half as long as the carapax, 

 nearly three times as long as the greatest breadth, which is near the 

 base, from where the margins arcuately converge to a narrow but ob- 

 tusely rounded tip, which is scarcely in advance of the small terminal 

 spine of the outer margin. 



The crowns of the mandibles are nearly as in Penceus. The mandibu- 

 lar palpi are very large, and reach nearly to the middle of the antennal 

 scales; the proximal segment is more than half as broad as long, nearly 

 twice as long as the distal segment, with the distal part of the mesial 

 edge straight and the outer-edge curved and directed inward distally, so 

 as to narrow the segment very much at the articu'ation of tiie terminal 

 segment, which is about twice and a half as long as broad, and ovate 

 with the tip rounded. 



The tirst maxilla is as in Benthcecetes Bartletti, except that the endog- 

 nath is expanded somewhat a little way from the base. 



The three distal lobes of the ])rotognath of the second maxilla in- 



