516 



THE FUR SEALS OF THE PRIBILOF ISLANDS. 



10 



branches from this basal part projecting forward and dorsalward. Testis situated 

 around and among tlie branches of the ovary at their dorsal ends. Ova discharged 

 into the atrial chamber, where they collect in its posterior portion to undergo devel- 

 opment (fig. 8, ov.) (In this figure the visceral mass, lying loosely on the test, has 



been turned halfway around; so that the rec- 

 a turn, r, is made to point toward the posterior 



instead of toward the anterior end of the test. 

 This makes the ovary seem on the left instead 

 of on the right of the body.) Ova and sperm 

 ripe in the same individual at the same time. 

 Ova very large, 0.57 mm. in diameter; contains 

 much food yolk. 



This species is so distinct from either of the 

 other two species of the genus, a comijarison 

 between which was made in connection with the 

 description of J), tuberculata, that it would be 

 superfluous to dwell upon the point. It is represented in 

 the collection by a larger number of specimens than any 

 of the other species, there being some hundreds present. 

 All appear to come from St. Paul. 

 Styela greeleyi, new species. 



General cliaracteristics. — Body elongated, somewhat 

 flattened; tapering slightly toward both ends, at the pos- 

 terior abruptly contracted into a slender peduncle, which is from one and a half to 

 two times as long as the body. Dimension of one of the largest specimens: Length 

 of body, 1.8 cm.; greatest diameter, 1.1 cm,; length of peduncle, 4.3 cm. Color, 

 yellowish brown, tinged with red on the anterior half. Siphons, bright orange red. 

 Surface covered with longitudinal folds, which are 

 less pronounced on the peduncle. Transverse folds 

 present on the anterior half, but these possibly due 

 to contraction. (Figs. 9 and 10.) 



Test. — Tough, coriaceous, but scarcely 1 mm. 

 thick even through the folds. Dull grayish white 

 on the inner and cut surfaces. 



Mantle.— Closely attached to test; muscula- 

 ture weak. 



Branchial apparatus. — Siphons projecting 

 slightly, both placed at anterior end close together, 

 the atrial pointing straight forward, while the 

 branchial is bent over so that the opening is di- 

 rected ventrally. Branchial tentacles simple, of 

 two sizes arranged in two concentric circles, the 

 outer circle containing about 15 large and the 



inner about 30 small ones. Circles close to the peripliaryngeal band. (Pig. 13.) 

 Atrial tentacles filiform, numerous. Dorsal tubercle inconspicuous, the mouth of 

 the hypophysis irregularly horseshoe shaped, close to the tentacles, which nearly hide 



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