1909.] NATURAL SCIENCES OF PHILADELPHIA. 259 



become more complex and then more massive, with the lateral teeth 

 shorter and less distinct; finally they coalesce into a flexible band. 

 Those of the middle series (fig. 28) are generally similar to the outer, 

 but tend toward greater symmetry and undergo similar changes 

 caudally, where they tend to unite with the jaws of the outer series 

 as well as with one another. Sometimes the outer series is partly 

 deficient. 



The type is a female filled with large eggs and of a generally pale 

 color tinged with rich rusty yellow anteriorly. 



It was taken at Monterey Bay on June 20, 1905, by Mr. E. C. Starks. 

 Additional specimens were collected at the point above Third Beach, 

 vicinity of Monterey Bay, on July 12, 1904. 



This species resembles Anisoceras vittata Grube and Oersted some- 

 what closely, and more complete information regarding the latter, 

 which was taken at Punta Arenas, Costa Rica, may establish their 

 identity. It is, however, much larger than Oersted's specimens and 

 differs from Grube's description in several other respects. 



GLYOBRID^l. 

 Glycera nana Johnson. 



Glycera nana Johnson, Proc. Bos. Soc. Nat. Hist., XXIX (1901), p. 411, 

 PI. 10, figs. 103, 103a. 



Seven specimens, one of large size, were taken at San Diego. 



Glyoera rugosa Johnson. 



Glycera rugosa Johnson, Proc. Bos. Soc. Nat. Hist., XXIX (1901), pp. 409- 

 411; PL 10, figs. 101, 102. 



San Diego, six specimens. Some of these have the branched gills 

 extended on nearly every parapodium; on one they reach far beyond 

 the parapodial lobes; others have all or nearly all retracted. 



Hemipodia borealis Johnson. 



Hemipodia borealis Johnson, Proc. Bos. Soc. Nat. Hist., XXIX (1901), 

 pp. 411, 412; PI. 10, figs. 104, 104a. 



San Diego, four specimens ; Monterey Bay, one at point above Third 

 Beach, July 12, 1904. 



An example 60 mm. long and 2.5 mm. in maximum width (exclusive 

 of the parapodia) in the anterior fourth tapers regularly to the caudal 

 end, and has 141 strongly biannulate segments which become relatively 

 longer caudad where the larger podous annulus may be again divided. 



The "head" consists of a wider basal two-fifths or more, consisting 

 of at least two segments bearing minute setigerous parapodia, the 

 peristomium and a portion of the prostomium. It includes the mouth, 

 which is bounded laterally by a pair of large, low pads. The anterior 



