IS)!''] Essenbcrg: Some Species of Aphroditidae 409 



The ventral lip extends to the third segment. The facial tubercle 

 is prominent, covered with papillae, and ends in a finger-like projec- 

 tion hanging over the mouth ventrally. 



The fifteen pairs of elytra (pi. 33, fig. 35) are thin, tough, and 

 transparent, and are attached to the notopodia by strong elytrophores. 

 Slight venations radiate from the place of attachment in all directions. 



The branchiae begin on the sixth segment, occurring thence 

 posteriorly on all cirriferous segments except the last few caudal ones. 

 They are hatchet-shaped (pi. 33, fig. 36), with from seven to nine 

 irregular, prominent projections. 



The parapodia are biramous (pi. 33, fig. 28). The neuropodia 

 are subtruncate, ending in the usual three-step-like fashion. The tips 

 of all the neurosetae are stronglj' pillose. Their color is dark brown, 

 with a bluish reflection in light. The neurosetae from the dorsal series 

 are the largest (pi. 33, figs. 29, 30). The four setae of the second row 

 are finer (pi. 33, fig. 33). The six setae from the ventral series are 

 the finest and have a subterminal enlargement (pi. 33, fig. 31). The 

 neurosetae from the second parapodium (pi. 33, fig. 34) are specially 

 modified, ending in a fine point, and are covered with prominent 

 spines. The caudal setae have the same shape as the setae of other 

 parapodia except that their ends are perfectly smooth. The doi'sal 

 setae are arranged in two rows. The dorsal row consists of four setae 

 and the ventral of from eight to ten. The notosetae are long and 

 brown, with pale, colorless ends terminating in a fine, strongly curved 

 hook (pi. 33, fig. 32). 



The dorsal cirrus is long, smooth, tapering gradually towards the 

 distal end, and terminating in a bulbous tip. Its length is about eight 

 times that of the neurocirrus (pi. 33, fig. 28). 



Occurrence. — No data as to its habitat are available, but it is 

 probable that the specimen came from collections made oft" the coast 

 of southern California in 1901-1904. 



4. Aphrodita cryptommata, sp. nov. 



PI. 34, figs. 39-.30; pi. 37, fig. 83 



Comparisons. — This species was labeled as Aphrodita parva and 

 was evidently identified as such by Treadwell (1914). Comparing 

 the specimen here described with the one sent to us by Dr. P. J. 

 Moore, some essential difi'erences were discovered. 



