MUSEUM OF COMPARATIVE ZOOLOGY. 



197 



These differences, although slight, are constant, and should be recognized in 

 our nomenclature, if any significance is attached to geographical variation. 



The last thoracic appendages are chelate in the adult female, while they are 

 but imperfectly so in breeding males; that is, in the male the "thumb' 5 is 

 very much shorter than the index. 



Station 3353. 695 fathoms. 1 male. 

 " 3392. 1270 " 1 female. 



" 3393. 1020 " 3 males, 3 females. 



" 3394. 511 " 12 males, 20 females.* 



" 3418. 660 " 1 male, 1 female. 



3419. 772 " 1 female. 



" 3424. 676 " 1 female ovig. 



Polycheles granulatus, sp. nov. 



Carapace long oval, broadest across the anterior branchial region ; dorsal 

 surface granulated, but nearly devoid of spines ; there are two small rostral 

 spines, and back of these, on the low granulated median carina, lies another 

 pair followed by one or two spinules on the gastric area. The submarginal 

 ridge is incurved and composed of minute spinulose granules. Orbital notch 

 narrow, armed* with a spine at its internal angle and with another at its ex- 

 ternal angle. Marginal spines thus disposed : 9 (or 10) — 3 — 15. The an- 

 terior abdominal pleurae are rounded* gradually becoming acute as one passes 

 backward to the sixth. The posterior thoracic legs in the sole specimen seen 

 (a female) end in a small but perfect chela. 



Length, 99.5 mm. ; length of carapace, 45 mm. ; greatest width of carapace* 

 37 mm. ; length of cheliped, 118 mm. ; ischium, 19 mm. ; merus, 33 mm.; 

 carpus, 22 mm. ; basal part of propodus, 14.5 mm. ; dactylus, 22 mm. 



Station 3380. 899 fathoms. 1 female. 



Eryonicus caecus Bate? 



Station 3375. 1201 fathoms. 1 male, 62.5 mm. long. 

 " 3377. 764 " 1 female, 40 mm. long. 



" 3383. 1832 " 1 juv., 37 mm. long. 



" 3388. Surface to 400 fathoms, submarine tow-net. 4 juv., 19-29 mm. 

 long. 

 Bate's description of E. crecus was drawn up from a single immature speci- 

 men, 13 mm. long, in which the first abdominal appendages were undeveloped. 

 The largest of the *' Albatross " specimens is a sexually mature male with well 

 developed gonopods. It differs from Bate's specimen in having much shorter 

 spines upon the carapace and abdomen ; the spines of the lowest series on the 

 branchial region decrease in length posteriorly, while in the type spceimen the 

 posterior spines in this row are the longest. Whether these discrepancies are 



