Gizzard of a Deep-sea Cephalopod, 53 



Dr. Brady in his Report on the Copepoda of the ' Challenger ' 

 Expedition, supplemented by a careful examination of the 

 specimens from the stomach of the Stauroteutlu's. 



Family Pontostratiotidse, A. Scott *. 

 Genus PONTOSTRATIOTES, G. S. Brady. 

 Pontostratiut's abijssicula, G. S. Brady. 



(Pis. ii. & in.) 



1883. Pontost ratiotes abyssicola, Brady, Report on the Scientific Results 

 of the Voyage of II. M.S. ' Challenger,' Zool. vol. viii. p. 105, pi. xliv. 



Description. — Anterior antenna? tolerably elongate, slender, 

 and composed of eight joints ; the first three are moderately 

 elongated, but the second and third are each rather shorter 

 than the joint that precedes it ; the upper distal angle of the 

 second joint is produced into a strong forwardly-projecting 

 tooth; the remaining joints are small, but the fourth from 

 the end is rather longer than the others. Posterior antennae 

 slender, two-branched; inner ramus elongated, outer short and 

 four-jointed. Mandibles stout, armed with strong teeth and 

 provided with a large two-branched palp. Maxilla? stout and 

 furnished with several spiniform marginal bristles and long, 

 rather slender setae. First maxillipeds moderately elongate, 

 stout, and bearing several setiferous processes on the inner 

 aspect. Second maxillipeds smaller and composed of four 

 joints, first joint considerably longer than the combined 

 lengths of the other three, end-joints small, no terminal claw. 



The first four pairs of thoracic legs with both rami three- 

 jointed, outer and inner rami of about equal length ; both 

 rami of the first pair rather shorter than in the other three 

 pairs, and an elongated spiniform seta springs from the inner 

 angle of the second basal joint, and extends to near the end 

 of the inner ramus. 



The fifth pair consist each of a single, elongated, narrow, 

 two-jointed branch, end-joint about five times longer than 

 broad and provided with several long spiniform marginal and 

 terminal setae. Caudal rami, which are somewhat abnormal 

 and resemble tho.-e of ^Egisthus, Giesbrecht, are extremely 

 long and slender and close together, and assume a setiform 

 appearance. 



The carapace is armed with several long and strong toothed 

 spines, which are directed backwards. 



* This family was instituted for Pontostratiotcs and the nearly related 

 genus JEgisthus, Giesbrecht : see Report on the Copepoda of the ' Siboga ' 

 Exped., by A. Scott, p. 232 (1909). 



