1910] Kofoid: A Revision of tin Genus Ceratocorys. 181 



merely extremes of fluctuating variations arising in response to 

 temperature conditions, being therefore of seasonal local char- 

 acter though the short horns also appear at fission in the younger 

 parts of the skeleton of otherwise long-horned forms. 



Occasional in semi-tropical plankton at San Diego. Abundant 

 at Naples. 



Ceratocorys armatum (Schiitt) Kofoid. 



Goniodoma acuminatum var. armatum, Schiitt (1S95), p. 153, pi. 9 



fig. 32. 

 Goniodoma fimbriatum, Murray and Whirring (1S99), p. 325, pi. 27, 



fig. 1, a, b. 

 Goniodoma armatum (Schiitt), Schmidt (1901), p. 135. 

 Gonyaulax fimbriatum, Schroder (1906), p. 329. 



A large species with 3-4 short spines arising at margins or 

 angles of antapical plate, and at posterior end of left ventral fin. 

 The girdle is prae-equatorial at the anterior third of the angu- 

 lar body. Epitheca about 0.5 of the altitude of hypotheca. 

 Apical region small. Both apical and antapical regions tilted 

 obliquely toward ventral region. Girdle-lists and ventral fins 

 much less developed than in ('. horrida. Superficial resemblance 

 to Goniodoma polyedricum. Broad pore-free intercalary bands 

 often along sutures which are sometimes marked by low. toothed, 

 or stoutly ribbed fins. Pores large, especially so in apical plates 

 and ventral regions and along suture lines. Contents dense, 

 chromatophores brownish. Plates of typical generic type. 



Abundant at San Diego and Naples. 



The skeletal morphology of this species is unquestionably 

 that of Ceratocorys, and there is no justification for its inclusion 

 in Goniodoma. Murray and Whitting's (1899) Goniodoma 

 fimbriatum is merely a heavily ribbed individual. Schroder 

 (1906) gives no grounds for his transfer of the species to the 

 genus Go nyaulax (lapsus?). Schmidt (1901) has correctly sur- 

 mised the identity of Murray and Whitting's Goniodoma fimbria- 

 tum and Schiitt's G. acuminatum var. armatum as well as its 

 specific distinctness. 



