NO. 1989. A8CIDIANS FROM NORTHEASTERN PACIFIC— BITTER. 475 



Albatross 2971, lat. 34° 20' 30" N.; long. 119° 37' 50" W., off 

 southern California, 29 fathoms, bottom fne. gy. s. m., February 

 11, 1889; 1 specimen, pyramidal form. 



Albatross 2972 (type-locality), practically same location as 2971; 

 but 61 fathom?, bottom gn. m.; about 40 specimens, all but three or 

 four of the ''flat form." 



Albatross 3227, lat. 54° 36' 30" N.; long 166° 54' W., Bermg Sea, 

 225 fathoms, bottom gn. m.. May 23, 1890; 2 specimens, pyramidal 

 form. 



Type.— Cat. No. 5684, U. S. N. M. 



STYELA SABULIFERA, new species. 

 Plate 34, figs. 24-26. 



Sujjerficial characters. — Very regular in outhne and rigid in con- 

 sistency, covered all over with a closely set layer of black sand 

 grains. Orifices rather near together at the anterior end, without 

 siphons and scarcely recognizable in the preserved specimens. Body 

 distinctly longer than broad, antero-posteriorly, and considerably 

 compressed or wedge-shaped, the posterior end being thinnest (pi. 

 34, fig. 24). Some specimens with a considerably elongated process 

 near the posterior end. Surface of the rather thick test bearing 

 many short processes longest along the posterior margin of the body. 

 Mantle musculature strong, the outer layer of circular fibers stronger 

 than the inner layer of radial fibers. Length of a full-sized individual 

 17 mm, width 14 mm, thickness about 10 mm. 



Respiratory system. — Four lobes of the orifices clear cut, small, but 

 rather distinct because of theu* whiteness. Branchial tentacles 

 simple, 20 to 30, of different sizes (fig. 25 b. t), the larger and smaller 

 alternating naore or less regularly. Hypophysis Qiy.) with a simple 

 circular or oval-shaped mouth. Branchial membrane with 4 folds 

 on each side, longitudinal vessels (i. I. v.) on folds of two specimens 

 as follows : 



10-5-0-4-0-6-0-5 L. 

 [0-3-0-5-0-3-0-13 R. 



No. 1. Endostyle 



AT o T? A +1 [0-4-0-5-0-4-0-7 L. 

 No. 2. Endostyle |^_|_Q_^_^_^_Q_^^j^_ 



No vessels between the folds; stigmata straight, 12 to 20 in the 

 meshes. Dorsal lamina entire (d. I.), that is, without marginal teeth 

 or ribbings. 



Alimentary system. — On the left side, first part of intestine dou- 

 bling back into close contact with stomach, rectal portion extending 

 forward parallel with and near to the dorsal edge of the body. Stom- 

 ach long with about 22 distmct obhque folds; anus with many small 

 marginal lobes. 



