DORIDAE 299 



stricted. There is only one species in the genus. The genera Cuvieria Rang 

 and Herse Gistel 1848 (non Oken 181 5) are synonyms. 



Cuvierina columnella Rang Cigar Pteropod 



Figure 64m 



Worldwide, pelagic. (43° N. to 42° S.). 



10 to 14 mm. in length. See generic description and figure. The shell 

 varies somewhat in shape. C. oryza Benson, C. iirceolaris Morch and cmi- 

 cellata Pfeffer are the same. Common. 



Suborder GYMNOSOMATA 



Pteropods characterized by the absence of shell, pallial cavity and 

 mantle-skirt; by the presence of a well-developed head, bearing two pairs of 

 tentacles, of which the two posterior bear rudimentary eyes. Jaws and radula 

 present. Found pelagic in all seas, and sometimes in great abundance. Rarely 

 exceed one inch in length. They are carnivorous. Ascend to the surface at 

 night, and sink to a lower level in the daytime. They are not treated in this 

 book. The group contains such genera as Pjieuviodennopsis Bronn 1862, 

 Fneumodernia Cuvier 1805 {=^ Piieiimono derma Agassiz), Cliopsis Troschel 

 1854 {= CHonopsis Bronn), Notobrmichaea Pelseneer 1886, Clione Pallas 

 1774, PaedocUone Danforth 1907, Anopsia Gistel 1848 (= Halopsyche 

 Bronn and Euribia Rang). 



Order NUDIBRANCHIA 



(Nudibranchs and Sea-slugs) 



Super jamily DORIDACEA 



Family DORIDIDAE 



Branchial plumes in an arc or circle usually joined together at their bases, 

 usually retractile into a cavity. Rhinophores always with a perfoliate club. 

 Pharyngeal bulb never suctorial. 



Genus Archidoris Bergh 1878 



Body not hard, dorsum granular or tubular; tentacles short, thick, with 

 an external, longitudinal sulcus. No labial armature. Branchial plumes not 

 numerous, 3- to 4-pinnare. Center of radula naked, marginal teeth hooked 

 and bearing minute denticles. Penis and vagina unarmed (without hooks). 



Archidoris montereyensis Cooper Monterey Doris 



Plate i6h 



California. 



I to 2 inches in length. Rhinophore stalks conical, the clavus slightly 



