48 CLASSIFICATION. 



DONDERSIIDAE Simiioth. 



Body often worm-like. Cuticle thin; spines flat and solid. Papillae lack- 

 ing. Radula distichous, monoserial or lacking. Salivary glands globular, sac- 

 or tube-like. Gill folds lacking. Coelomoducts united or separate. Copulatory 

 apparatus may be present. Ventral fold and furrow may be absent. Living 

 free, or on corals, etc. 



Herpomenia, gen. no v. 



Length 11-18 mm. by 0.6-0.9 mm. Foot smoothed out, ciliated. Ventral 

 salivary glands very large, encircling the thick walled very muscular pharynx. 

 Radula lacking. 1 pair seminal receptacles. Shell gland almost globular. 

 Type of genus 

 H. platypoda, sp. nov. 



With the characters of the genus. Aleutian Ids., Alaska, (p. 151.) 



Dondersia Hubrecht, 18SS. 



Body long, length index 10-48. 1 ventral fcjld. Spicula needle- or spatula- 

 shaped, flat. Cuticle very thin, no papillae. Dorso-terminal sense knots 

 present. 1 pair of short ventral salivary glands, which unite before opening 

 out into the pharynx. Radula small, monoserial or biserial. Mouth cavity and 

 pharynx opening separated from each other. No copulation spicula. Type 

 of genus, D.festiva. 

 ZX californica, sp. nov. 



Dorsal salivary glands very scant; ventral small. Radula with at least 

 12 pairs of teeth. Immature. California, (p. 155.) 



Ichthyomenia Pilsbry, 1S98. 



Body cylindric-conic, broader behind, narrowed in front. Cloaca opening 

 a terminal transverse slit, a prominence in front of it. Foot groove and foot 

 present, disappearing posteriorly. Cuticle not papillose, the ventral spicules 

 leaf-shaped, the rest scale-like, imbricating. No gills. Radula wefl developed 

 or rudimentary, with apparently two rows of teeth. Length 5 to 13 times the 

 breadth. Type of genus, I. ichthyodes. 

 I. porom, sp. nov. 



Body pale yellowish white, 16 mm. long by 1.2 mm. thick. Scales fish-like 

 antl club-shaped. Upwards of 50 sensory pits in the anterior end. No radula. 

 California coast, (p. 159.) 



