COPEPODS OF THE WOODS HOLE EEGION 



133 



cially of the male. From the distribution here given it is shown to 

 be a northern form, and is more or less of a straggler in the present 

 area. 



HETERORHABDUS SPINIFUONS (Claus) 

 Figure 90 



Heterochaeta spinifrons Claus, Die frei lebenden Copepoden, p. 182, pi. 32, 1863. 

 Heterorhabdus spinifrons Giesbuecht and Schmeil, Das Tierreich, Lief. 6, 

 Copepoda, p. 114, 1898. 



OcGurrenoe. — Twenty males and females taken in a vertical haul, 

 Station 20107, Grampus, off Georges Bank. 



Distribution.— Messina, (Claus) ; north of British Isles (Mobius) ; 

 tropical Pacific (Giesbrecht) ; Malta (Thompson) ; Mediterranean 

 (Giesbrecht) ; Gulf of 

 Guinea (T. Scott) ; Ma- 

 lay Archipelago (A. 

 Scott) ; northern Atlan- 

 tic (Cleve) ; California 

 coast (Esterly) ; Adri- 

 atic (Pesta) ; Indian 

 Ocean (Thompson and 

 Scott) ; Gulf of Maine 

 (Bigelow) : 



Color. — B o d y trans- 

 parent and colorless ; 

 ovaries, oviducts, and 

 eggs yellowish green ; 

 ventral portion of geni- 

 tal segment light brown, 

 often with a yellowish 

 tinge; no eye visible. 



Female. — Frontal 

 process transformed into 

 a sharp spine; first antennae reaching 4 or 5 segments beyond the 

 caudal rami ; end segment of third exopod a broadened oval, wider 

 and longer than in the second and fourth legs; endopod of fifth leg 

 longer than the two basal segments of the exopod ; falciform spine on 

 inner margin of second exopod segment not so long as the end seg- 

 ment; terminal spine denticulate on the outer margin and half as 

 long as end segment. Total length, 3-3.5 mm. 



Male. — Smaller and more slender than the female; in the right 

 fifth leg the second basipod and the second exopod segments have 

 each an inner process, the latter bipartite at the tip; end segment 

 one-half longer than the two basal segments, slender, tapered coni- 



FiGURE QQ.— Heterorhabdus spinifrons: a, Female, dor- 

 sal (after Sars) ; 6, female, fifth leg ; c, male, fifth legs 



