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1909.] NATURAL SCIENCES OF PHILADELPHIA. 241 



of Monterey Bay, at "big tide pool, Lighthouse Point," on June 28, 

 1904, and at " point above Third Beach," on July 12, 1904. 

 All of the specimens are dark colored, with heavily mottled elytra. 



Halosydna reticulata (Johnson). 



Polynoe reticulata Johnson, Proc. Cal. Acad. Sci. (3), Zoology, I, pp. 170, 

 171; PI. VII, figs. 32-41a, PI. VII, figs. 47-476. 



Eleven specimens from San Diego occur in the collection and only 

 two from Monterey Bay, where they were dredged on July 9, 1904. 



These specimens exhibit considerable variation. Some are almost 

 pigmentless and of a nearly uniform pale yellow, gray or brown; 

 others are thickly mottled with deep brown on the elytra and barred 

 on both dorsal and ventral surfaces of the body. Usually a brown 

 spot or ring is present on the elytra over the point of attachment. 

 The elytra differ greatly in the degree to which the surface is roughened 

 with conical projections and in the number of marginal cilia. The 

 latter appear to be gradually lost with increased age and size. They 

 are plentiful on the elytra of small specimens and on newly regenerated 

 elytra, fewer on those of medium size and frequently totally absent 

 from larger specimens, as is the case with the two from Monterey Bay. 

 As a result of loss and regeneration the elytra of some specimens are 

 of very unequal size. The labels give no information concerning 

 commensalism. 



Lepidonotus caeloris Moore. 



Lepidonotus caloris Moore, Proc. Acad. Nat. Sci. Phila., 1903, pp. 412-414, 

 PI. XXIII, fig. 12. 



A solitary specimen of small size was dredged at Delmonte wharf, 

 Monterey Bay, on July 12, 1904. 



Lepidasthenia gigas (Johnson). 



Polynoe gigas Johnson, Proc. Cal. Acad. Sci. (3), Zoology, I, pp. 172-175; 

 PL VII, figs. 33, 426; PI. VIII, figs. 48, 49. 



Three examples from San Diego. One has the parapodia much 

 entangled with Terebellid tentacles and probably came from the tube 

 of the Am.phitrite with which Johnson states that it lives commensally. 

 Notopodial setse are more usually present in the anterior parapodia, 

 and the first parapodium bears a single seta of a form intermediate 

 between the typical notopodial and neuropodial types. 



One specimen 89 mm. long and having 83 somites has the elytra 



arranged in symmetrical pairs, except on somite LXV, which bears 



the right one only, the left side bearing a notocirrus; there are 39 pairs 



on the segments numbered 2, 4, 5, 7, 9, 11, 13, 17, 19, 21, 25, 27, 28, 30, 



16 



