1904.] NATURAL SCIENCES OF PHILADELPHIA. 157 



SABELLID5: AND SERPULIDJE FROM JAPAN, WITH DESCRIPTIONS OF NEW 

 SPECIES OF SPIRORBIS. 



BY J. PERCY MOORE and KATHARINE J. BUSCH. 



In these Proceedings for 1903 was published a paper describing 

 most of the Polychseta taken in Japanese waters and elsewhere in the 

 North Pacific in the spring of 1900 by the U. S. F. C. steamer Albatross. 

 The present paper is a continuation of that contribution, and is based 

 on the same collections. A third part will some time deal Avith a num- 

 ber of species belonging to various families, the descriptions of which 

 are withheld until some desirable comparisons can be made. Among 

 the species previously described a considerable admixture of circum- 

 boreal forms was found, most of them from the more northern stations. 

 That none such is found among the Sabellidee and Serpulidse probably 

 results from the fact that all of the species described in this paper came 

 from the southeastern coast of Honshu, and especially from Station 

 3,707, on a sandy and gravelly bottom in Suruga Bay. Saint-Joseph's 

 revision of these families was largely used as a guide in the generic 

 references, but even with this help much difficulty was found in satis- 

 factorily placing several of the species, and it will be noticed that some 

 of them, and particularly Sabella japoiiica and Pomatoceras aurituhis, 

 depart widely from the generic types in some respects. In the enu- 

 meration of segments the collar setse have been counted as belonging 

 to the first of peristomial somite. 



I take this opportunity to state that Maldane coronata and Axiothea 

 campanulata of my former paper are synonyms respectively of M. 

 gotoi and Cbjmene harai Izuka. Although Izuka's paper was pub- 

 lished some months before mine it was not seen by me luitil after 

 the correction of the final proofs. 

 Sabella japonica n. sp. (PI. XI, fig.s. l, 2; PL XII, figs. 39, 40.) 



Without the branchiie the type specimen has a length of 25 mm., 

 of which the thorax takes 5 mm., and is 2.5 mm. in diameter; the de- 

 tached branchia? are 7.5 mm. long. A second specimen without bran- 

 chiae is 23 mm. long. As the branchiae are detached some doubt 

 attaches to them. They are much twisted, with 15 pairs of rather 

 short, thick radioles slightly coiled inward at the ends; the barbs are 



