17G 



both borders of the carpus is a spine : the hand is a little longer than the 

 merus, and the fingers are as much longer than the palm as they are shorter 

 than the carpus. The 5th pair of thoracic legs are imperfectly chelate in the 

 male. 



The epipodites of the external maxillipeds are long, and those of the 

 thoracic legs ascend a good way into the branchial chamber. 



In the unique male the length of the carapace in the middle line is 36'5 

 millim., of the abdomen 44 millim., and that of the large chelipeds is 94 millim. 



From off Colombo, 675 fathoms. 



Faxon regards this species as, at most, but a geographical race of P. gri/u><- 

 ln/i/x from the neighbourhood of the Gulf of Panama. 



Regd. No. -;- (Type of the species). 



Eryonicus, Spence Bate. 



Eryonicus, Spence Bute, Ann. Mag. Xat. Hist. (5) X. 1882, p. 457, and Challenger Crust. Macrura, p. 122 : 

 Faxon, Mem. Mns. Comp. Zool., XVIII. 1895, p. 108. 



In all essential characters this genus resembles Potycheles, from which it 

 differs in having (1) the carapace globosely inflated and longer than the abdo- 

 men, (2) the inner (longer) antennular flagellum much shorter than the carapace, 

 (3) the renal tubercle of the basal joint of the antennular peduncle much more 

 prominent, (4) the 1st pair of thoracic legs though of quite the same form- 

 shorter, and (5) the integuments submembranous. 



As in typical Poh/cheles, the epipodite of the external maxillipeds is a mere 

 papilla, and those of the thoracic legs (1st 4 pairs) are merely membranous 

 expansions of the bases of the podobranchias. 



As in Pohjcheh'S and Penfacheles, the eyes are immovably impacted in deep 

 sinuses of the anterior margin of the carapace, though they do not so completely 

 fill the sinuses. 



And as in all recent Eryonidse, the posterior angles of the carapace are 

 firmly bolted to the 1st abdominal somite. 



I agree with Faxon that the species of Eri/onicuft probably belong to the 

 " Meteoric " (Nectic) fauna. 



104. EryOllicUS indicilS, Alcock and Anderson. 



.' Pentachetcs (? immature), Wood-Mason, Ann. Mag. Nat. Hist., Feb. 1891, p. 199. 

 Eryonicus indicus, Alcock and Anderson, Ann. Mag. Nat. Hist., April 1899, p. 290. 

 ILLUSTRATIONS OK THK ZOOLOGY OF THE INVESTIGATOR, CRUSTACEA, PLATE L. FIG. 3. 



Carapace globose, ovoid but posteriorly truncate, longer than the abdomen. 

 On its anterior margin are a pair of rostral spines, a spine at either angle of 



