78 BULLETIN 100. UNITED STATES NATIONAL MUSEUM. 



much shorter and stouter spicules occur in the test. These are often 



very blunt at both ends, and one end may be somewhat enlarged, 

 forming a rounded head studded with minute projections. Spicules 

 with such an enlarged end (the so-called "scepter-shaped" spicules) 



may have the opposite end either blunt or tapering to a point. 



Tentaeles of unequal sizes irregularly arranged: 11 large ones (not 

 all of one size) and as many smaller ones of various sizes were 

 counted in a fairly large individual. The largest are two or to some 

 extent three times compound, but the branches are not numerous. 

 They bear broad membranes. The tips of the small branches are 

 often, but not always, slightly swollen. 



Dorsal tubercle horseshoe-shaped with the open interval forward. 

 The horns are generally incurved or more or less inrolled in large 

 specimens, but in one individual they turn slightly out. 



Dorsal lamina broken up into a series of long, narrow, pointed 

 proees>es. 



Branchial sac, with well-developed folds separated by rather 

 narrow intervals. The number of folds varies in different indi- 

 viduals and will probably be found to average greater in old and 

 large ones. In medium sized, yet fully adult, individuals there 

 are i> on each side, or often only 8 on the left side, while in one 

 large specimen as many as 12 (the last two very rudimentary) were 

 found on the right side. They could not be accurately counted on the 

 left side of this specimen. Transverse vessels of four or five orders, 

 often quite regularly arranged: the small ones cross the stigmata. 

 Stigmata of moderate length and usually quite narrow. Internal 

 longitudinal vessels numerous, rather slender, placed fairly close 

 together on the sides of the folds, but separated by from 6 to 10 (or 

 even 12) stigmata on the intervals between foils. The following 

 was their approximate distribution in one of the larger specimens: 



(/. 4 (16) 3 (20) 2 (22) 2 (23) 2 (22) 3 US) - (14) 2 (10) 1 (5) p, 



Digestive tract curved in a simple broad loop. Stomach elongated, 

 having on it> dorsal and mesial aspects a large and dense mass ^\ 

 small, short hepatic tubules of a greenish color, which are crooked 

 and often slightly branched. Rectum very short, margin of anus 

 with two lips, or somewhat sinuous, but not conspicuously lobed in 

 the individuals examined. 



One elongated slightly curved horizontally or obliquely placed 

 gonad on each side. Each gonad consists of a long sinuously curved 

 ovary bordered by the numerous small irregularly shaped testes. On 

 the left side the gonad lies in the intestinal loop, though the intestine 

 may overlap it a little at one or more points where the ovary forms 

 wide sinuous curves. 



