1^11] Kofoid: The Genus GonyauJax. 205 



San Diego. Skeletons or moribund individuals of Alaskan species 

 may be expected in the deeper plankton (ca. 50-100 fathoms) as 

 far south as San Diego and are therefore inehided in this key. 

 It is to be expected that the further examination of the plankton 

 of subtropical facies occurring at San Diego during late autumn 

 and early winter will bring to light additional species normal to 

 warmer seas. No fresh-water species has as yet been reported 

 from California. 



I. Key to Species of Gonijaulax in California Waters 



]. Body elongated, fusiform, length 1.5 transdiameters or more 2 



1. Body not elongated, length less than 1.5 transdiameters 3 



2. Antapex decidedly asymmetrical 4 



4. Very large, length over 100^, body deeply excavated, antapex 



in ventral view broadly rounded pacifica 



4. Large, length less than 100/^, not so deeply excavated, antapex 



obliquely truncate kofoidi 



2. Antapex nearly symmetrical 5 



5. Length less than 2 transdiameters Spiraulax joUiffei gen. nov. 



5. Length more than 2 transdiameters G. birostris 



3. Apex extended over to dorsal face 6 



3. Apex not extended on to dorsal face 7 



■6. Body elongated, surface vermiculate G. fragilis 



6. Body rotund, surface reticulate G. alaskensis 



7. Body spheroidal G. sphaeroidea 



7. Body not decidedly spheroidal 8 



8. Antapical spines not present 9 



8. With one or more antapical spines 10 



9. Body polyhedral, surface reticulate G. polyedra 



9. Body ellipsoidal, with longitudinal striae predominant 11 



11. Girdle with considerable displacement and overhang 



G. scrippsae 



11. Girdle with little displacement and overhang G. turbynei 



10. Apical horn 0.4 transdiameter, 5 antapical spines. ...G. triacantha 



10. Apical horn not so well differentiated, fewer antapical spines 12 



12. Surface with longitudinal striae predominant G. polygramma 



12. Surface with polygonal recticulations 13 



13. Large species, length 60-100/x, apical horn moderately differen- 



tiated G. diegensis 



13. Medium-sized species, 40-50yu, apical slightly differentiated 



G. digitals 



13. Small species, 30-40^, apical scarcely differentiated 



, G. spiniferai 



1 Sometimes without antapical spines. 



