1907.] NATURAL SCIENCES OF PHILADELPHIA. 361 



cred there by the rostral latera. The pcchiiicle is closely covered with 

 imbricating scales. 



Length of capituluni 7, breadth o.G nnn. 



Albatross Station 4,901. 

 Scalpellum weltnerianum n. sp. 



A species with fourteen loosely juxtaposed valves, regularly arched 

 carina with apical umbo, rounded roof, in section like the letter U, 

 and straight occludent border. There are very sparsely scattered 

 hairs 2 to 3 mm. long, chiefly near the occludent margin. The paired, 

 plates have a sculpture of close radial riblets. Tergum erect and acute. 

 Upper latus about twice as high as wide. Rostrum rather large, 

 lozenge-shaped, with a median rib. Rostral latus quadrangular, as 

 high as wide. Inframedian latus rather narrow, triangular, wdth acute 

 apical umbo. Carinal latus wdth convex carinal and concave upper 

 margins, the umbo apical, incurved. The carina extends in a narrow 

 triangle between the carinal latera to the peduncle. Peduncle clothed 

 with projecting scales curved in at their apices, arranged in six rows 

 of about fifteen scales each. 



Length of capitulum 11.5, breadth 5 mm.; length of peduncle about 

 5 mm. j >•>'■ 



Albatross Station 4,918, off Kyushu, in 361 fathoms, on a crinoid 

 pimuile. August 13, 1900. 



A very distinct species, shaped like /S. album, but strongly sculptured. 



Balanu s orcutti n. sp. Plate XXIX, figs. 1-7. 



A species closely related to B. declivis Darwin, living wholly imbedded 

 in sponges. 



Walls conical, with a small oval orifice and concave membranous 

 base. The carina is double the length of the other plates, strongly 

 arcuate, its projecting lower end tongue-shaped. The rostrum is 

 slightly longer than the lateral plates. The radii and alaj are well 

 sunken and smooth; the parietes marked with growth-lines and deep 

 fine wTinkles, oblique to the growth-lines, and in places broken into 

 long granules. The sheath is closely sculptured transversely with low 

 ridges and covered with yellowish cuticle densely ciliated along the 

 ridges. Below the sheath the plates are vertically ridged, especially 

 the carina. 



The scutum is triangular, densely sculptured with thread-like 

 lamelhc parallel to the basal margin. The articular ridge Is about 

 half the length of the plate, wide and triangular. The adductor ridge 

 is distinct but low. The cavities of the adductor and depressor 

 muscles are deep. 



