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PACIFIC SCIENCE, Vol. XIII, July 1959 
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Anterior fins start at level of posterior end of ventral ganglion, or farther anterior. .... 7 
Lateral fins joined by "fin bridge”; caudal fin bilobed lyra 
Lateral fins not joined 3 
Anterior fins rounded, widely separated from ventral ganglion. 4 
Anterior fins tapering; distance between anterior fins and ventral ganglion not great 
(distance is less than that equal to a length of the ventral ganglion) 5 
Teeth numerous; hooks 8-10; small-to-middle size species .................. .enflata 
Teeth few, protruding; large species hexaptera 
Moderately opaque species; delicate, of medium length; intestinal diverticula present. . 
decipiens 
Small, transparent species; no intestinal diverticula 6 
Tail segment tapers sharply posterior to tail-septum, marked constriction at septum; 
3-5 large, round ova in mature specimens; lateral septa connecting gut to body wall 
sometimes evident; posterior fins widely separated from seminal vesicles minima 
Constriction at tail-septum not great; ovaries club-shaped; posterior fins close to, but 
not touching, seminal vesicles; caudal fins touching seminal vesicles, .tenuis = friderici 
Posterior fins joining, or close to seminal vesicles 8 
Posterior fins not joining seminal vesicles; no intestinal diverticula; seminal vesicles 
head-shaped anteriorly; 9-10 hooks . bipunctata 
Voluminous collarette covering head and most of body .regularis 
Collarette not covering head 9 
Posterior teeth less than 20; intestinal diverticula may, or may not be present. 10 
Posterior teeth 20-30; intestinal diverticula absent; anterior fins tapering, reaching ven- 
tral ganglion; collarette obvious bedoti 
Intestinal diverticula absent. 11 
Intestinal diverticula present 13 
Posterior fins shorter than anterior fins; widest behind tail-septum; collarette of moderate 
size; anterior fins tapering, reaching ventral ganglion; hooks 6; posterior teeth 8-12 . . . 
.pulchra 
Posterior fins longer than anterior fins, or of about same length .12 
Posterior fins widest well behind tail-septum, jaws serrated, 6-7 in number 
serratodentata group 
a. Posterior fins close to seminal vesicles; seminal vesicles armed with spines antero- 
laterally, sometimes with a membrane connecting the anterior free end to the body; 
short space separating caudal fin and seminal vesicle; 12-15 mm. maximum length 
when mature .S.s. pacifica 
b. Seminal vesicle triangular in shape, anterior border slants posterolaterally; 10-12 mm. 
maximum length when mature; (common in California current) 
S. pseudoserratodentata 
Seminal vesicles close to but not in contact with caudal fin, separated by distance equal 
to about 14 length of seminal vesicle neglecta 
Seminal vesicles touch caudal fin 14 
Body very opaque, of uniform width from neck to tail- septum; collarette extends from 
neck to anterior fins; ovaries extending to neck, containing eggs of moderate size; in- 
testinal diverticula not obvious due to opacity of species robusta 
Body moderately transparent, of uniform width from ventral ganglion to tail- septum; 
ovaries containing large eggs that fill body cavity; intestinal diverticula obvious, .ferox 
