CLASSIFICATION. 47 



distichous, aj^parently comb-like with 16 cusps in each row. Seminal receptacles 

 10-12. Japan, (p. 125.) 



PRUVOTINIIDAE, nom. nov. 



Worm-like. Cuticle, as a rule, thick; spines as in Proneomeniidae or 

 hook-like. Epidermal papillae present or absent. Radula distichous, simple 

 or double comb-form, or lacking. Salivary glands globular, lobed or tubular. 

 Gill folds present. Coelomoducts united to form unpaired .shell gland. Copu- 

 latory apparatus may be present. Ventral fiuTow and fold present. Free or 

 living on coral, etc. 



Lophomenia gen. nov. 



With dorsal keel; length 24 mm., diameter 1.5 mm., 3 ventral folds. Cuticle 

 thick, with numerous needle-like spines in several layers; papillae few, club- 

 shaped. Radula distichous, 20 transverse rows. Dorsal salivary gland large; 

 ventral globular. 2 seminal receptacles, 2 bundles of many copulatory spines. 

 Type of genus 

 L. spiralis, sp. nov. 



With characters of the genus. Hawaii, (p. 128.) 



Alexandromenia, gen. nov. 



Body relatively short and thick, length 25-32 mm. by 3.5-5 mm. diameter. 

 Spicules small needle-like associated with larger radially directed ones. Papillae 

 very large, multinucleate. Foot, 5-9 folds. Gill folds 20-40. Numerous 

 pharyngeal glands and enormous lobulated glands opening on the sides of the 

 pharynx. Radula monoserial. 1 pair seminal receptacles. Type of genus 

 A. agassizi, sp. nov. 



Posterior end truncated, gills exposed. Monoserial radula with slightly 

 curved rectangular teeth. 40 gill folds. California, (p. 133.) 

 A. valida, sp. nov. 



Posterior end rounded, cloaca opening ventral. Teeth with two horn-like 

 projections. 20 gill folds. California, (p. 142.) 



Halomenia, gen no\'. 



Body short, length index 7:1. Spicules needle-like. Papillae large, in 

 places resting upon diverticula of the mid gut. 2 ventral folds. CJills 26-30. 

 Radula distichous. 1 pair seminal receptacles or vesicles. Type of genus 

 H. gravida, sp. nov. 



With the characters of the genus. Kurile Islands, (p. 146.) 



