178 



THE VOYAGE OF H.M.S. CHALLENGER. 



Nephropsis rosea (Willemoes-Suhm, MS.), (PL XXIII. figs. 1,2; PI. XXIV. fig. 1). 



Astacus rosea, Willemoes-Suhm, MS., Notes and Drawings made during the Expedition. 



Carapace slightly granular. Rostrum about half the length of the carapace, armed 

 with a strong tooth on each side near the middle, another at the base just above the 



eye, and a smaller one in a line behind the 

 last-mentioned. First pair of pereiopoda armed 

 with a small tooth on the lower distal angle of 

 the meros, and another on the upper distal angle 

 of the carpos. Coxal plates of the pleon infero- 

 posteriorly terminating in a sharp point, the 

 anterior margin of the first plate being slightly 

 serrate, the others smooth. 



Length, 25 mm. (1 in.), one specimen (male). 

 Habitat. — Station 57, May 30, 1873; lat. 

 32° 11' 7" IS., long, 65° 3' 20" W.; off Bermuda ; 

 depth, 690 fathoms. 



Carapace granular ; cervical sulcus well de- 

 fined ; rostrum long, wide, dorsally flat, narrow- 

 ing to a sharp point anteriorly, arched posteriorly, 

 depressed anteriorly, with the apex turned slightly 

 upwards, armed on each side near the middle 

 with a strong, long, sharp, anteriorly directed 

 tooth, and on the continuous ridge posterior to 

 the orbit, with one large, and behind it one small 

 tooth. The orbital notch is flanked on the outer 

 and lower sides with a long, simple, straight 

 tooth. 



The pleon is dorsally smooth, but granulated 

 in texture, and has the coxal plates distinctly 

 defined from the body of each somite. 



The ophthalmopoda are small, and situated 

 closely together beneath the rostrum, supporting a scarcely appreciable ophthalmus. 



The first pair of antenna? (PI. XXIV. b.) in the male consists of a peduncle which 

 originates immediately on the outer side below the base of the ophthalmopoda, the first 

 joint of which is excavated on the upper surface for the greater freedom of movement of 

 the eye, and a blepharis or row of strong cilia fringes the upper and distal extremity 

 of the excavated portion of the antenna, and forms a valuable protection to the visual 



Fig. 39. — Nephropsis rosea. From a drawing by 

 Willenioes-Sukni. 



