^^^- 3] Esterly. — Copepod Fauna. 55 



Family CALANIDAE. 

 Genus Spinocalanus Giesbrecht. 



Sinnocalanus, Giesbrecht ('92), p. 52, 209; ('98), p. 31. 

 Spinocalmms, Sars (:01), p. 22. 



Female: Eesembling CJausocalanus in general. Cephalotho- 

 rax of four segments, rostrum wanting. Abdomen of four seg- 

 ments, symmetrical. Anterior antennae 24-.jointed; maxilla, 

 maxillipeds, and swimming feet set with spines, the feet as in 

 Clansocalanus, but of the usual shape, and terminal joint of outer 

 ramus in second to fourth pairs with five inner marginal bristles. 

 Fifth pair of feet absent. 



Male unknown. 



Spinocalanus major n. sp. 



Female : Closely resembles 8. abyssalis Giesbrecht. Head, 

 and last thoracic segment rounded, not produced. Fourth joint 

 of inner ramus of posterior maxilliped with an outer marginal 

 bristle (lacking in S. abyssalis) . The outer marginal bristles of 

 the first and second joints of the outer ramus of the first foot are 

 much shorter and stouter than in >8'. abyssalis, and the inner 

 margin of those joints is provided with long and rather heavy 

 bristles, no such character appearing in ^S*. abyssalis. 



Length : 1.6 mm. 



Coloration : Whitish, translucent, but without pigment. 



Occurrence : One female. Coll. 946 ; plankton taken with 

 Kofoid water bucket NW. by W. from La Jolla, 5 miles, June 30, 

 1905 ; 200 fathoms. Depth at station, 210 fathoms. Temperature 

 9.5 C. at 200 fathoms. Midday. 



In the absence of figures, the rounded last thoracic segment in 

 S. major seems to distinguish it from S. magnus Wolfenden, in 

 which the ' ' last thoracic segment is produced on each side. ' ' The 

 latter species is considerably the larger. 



