360 PROCEEDINGS OF THE ACADEMY OF [July, 



NOTES ON SOME PACIFIC CIRRIPEDES. 

 BY HENRY A. PILSBRY. 



The following notes on Japanese and Northwestern Pacific species 

 of Scalpellum^ are based upon material collected by the U. S. Fish 

 Commission Str. Albatross in 1906, and are preliminary to an illustrated 

 report to be published later. A new Balanus, the second to be made 

 known of a peculiar group of forms living imbedded in sponges, is 

 described from material presented to the Academy by Mr. C. R. Orcutt. 



Of the "imperfectly calcified" species of Scalpellum, several are 

 now known from Japanese waters, belonging to two slightly different 

 groups, the group of S. intermedium and that of S. japonicum. 



In the group of S. intermedium the small inframedian latus is nar- 

 rowly triangular, widest at the base, with the umbo above and apical ; 

 the upper latus may be either triangular, biramose, or notched basally. 

 Here belong the Japanese S. nipponense Pils., and from southern 

 waters, *S'. intermedium Hoek and S. laccadivicum Annandale. All of 

 these are very closely related, and may even prove to be varieties of a 

 single species when fuller series of the growth stages come to light. 



In the group of 8. japonicum Hoek, the inframedian latus is broad 

 above, narrow at the base, with the umbo basal or near the base. Some 

 very interesting forms of S. japonicum were taken by the Albatross at 

 Stations 4,972 and 4,967, off the east coast of Nippon. They show 

 wide variation in the shape of the calcified portions of the upper and 

 carinal latera. Two individuals from Station 4,972 diverge so widely 

 from the type of S. japonicum that a subspecific name may be useful. 



Scalpellum japonicum metapleurum n. subsp. 



Differs from S. japonicum. chiefly by the shape of the upper latus, 

 which is calcified only in a band parallel to its tergal border. 



Scalpellum gonionotum n. sp. 



A species closely resembling Scalpellum balanoidcs Hoek, but larger, 

 and differing by the angular dorsal outline of the capituhuu and the 

 shape of the carina, which is straight, with very narrow sides and a 

 flat roof. There is a linear rostrum, not reaching to the base, or cov- 



' Pulilislicd l)y pcnnission of the Commissioner of Fislieries. 



