STAUROMEDUS^E HALICLYSTUS. 535 



Haliclystus salpinx Clark. 

 Plate 56, figs. I to 4. 



Haliclystus salpinx, CLARK, H. J., 1863, Journ. Boston Soc. Nat. Hist., vol. 7, p. 563. ACASSIZ, A., 1865, North Amcr. Acal., 



p. 64. HAKC KEL, 1879, Syst. der Medusen, p. 388. 

 ( >) Luccrnaria salpinx, GRAIFFF., 1884, Arbrit. Zool. Inst. \Vicn., Bd. 5, p. 344. 



Disk 25 mm. wide and (with the stalk) 20 mm. high. The 8 adradial arms are 45 apart, 

 and their ends are rounded. Each arm bears 60 to 70 very slender tentacles, the globose tips 

 of which are smaller than in H. auricula. The 8 marginal anchors are as long as the arms, 

 slender, and obliquely trumpet-shaped. The edge of the trumpet is considerably thickened 

 except at a narrow space on the proximal side, by the development of adhesive cells. The 

 center of this terminal expansion is occupied by a single tentacular remnant about as long as 

 half the breadth of the trumpet. Aboral stalk relatively longer and more slender than in //. 

 auriiiila, 4-sided in cross-section, with 4 longitudinal rows of interradial muscle-fibers. '1 he 

 stalk is 4-chambered and about 12 mm. long. The 8 genital cugans are nor MI wiili-K separated 

 as in H. auricula; their broader ends project only about half-way into the arms. The genital 

 sacs of each gonad are arranged in 4 radiating rows, the marginal rows being shorter than 

 the 2 middle rows. All of these sacs are of the same size and there are 40 to 45 of them in 

 each row. 



This species was obtained by Stimpson at Mount Desert Island, Maine. The best 

 description of it is that of Clark, 1863. Our figures are drawn from specimens obtained upon 

 eelgrass on the inner side of Ram Island near Manchester, Massachusetts, on September 7, 

 1905. Graeffe, 1884, appears to have lound this species at Trieste, Adriatic Sea, in June and 

 July. 



Haliclystus stejnegeri Kishinouye. 

 Halidystus slejnegeri, KISHINOUYE, 1899, Proc. U. S. National Museum, vol. 22, p. 126, figs. 1-3. 



Bell conical, funnel-shaped, 1.33 to 1.5 times as broad as high. 18 mm. wide. Peduncle 

 nearly quadrate in cross-section and about half as long as umbrella; its 4 interradial, longi- 

 tudinal grooves are formed by the attachment of the ta-niola. These septa meet at the longi- 

 tudinal axis and divide the internal space of the peduncle into 4 perradial chambers which 

 are continuous with the 4 perradial stomach-pouches. The surface of the exumbrella is smooth 

 and the line of demarcation between the stalk and the umbrella is distinct, although there is 

 no constriction at this point. There are a few small clusters of nematocysts at the radial 

 sinuses of the umbrella margin. The radial muscle plates are, as in other species of Hali- 

 clystus, developed in the perradii and interradii of the subumhrella. The margin of the 

 umbrella displays 8 equally spaced, adradial arms, all of the same size. The 8 incisions are 

 about as deep as the width of the arms themselves. 



There are 8 large, egg-shaped, perradial and interradial "anchors," which are about 

 half as long as diameter of peduncle; these are situated in the concavities of the clefts, alter- 

 nating with the tips of the 8 adradial arm-lobes. There are 8 adradial clusters of knobbed 

 tentacles, one at the end of each of the 8 arms. Each cluster contains 70 to 100 tentacles of 

 various sizes. 



Manubrium short and quadrangular, the lips reflected outward. The 8 rows of well- 

 developed gastric filaments extend from the base of the throat-tube to the proximal ends of 

 the 8 gonads. The 8 gonads are broad, leaf-shaped, tapering at both ends, and touch each 

 other along their proximal halves, so that the surface of the subumbrella is almost entirely 

 occupied by them. There are 100 to 150 round sacs in each gonad; these sacs are not arranged 

 in rows and those nearest to the 4 principal radii are the largest. There are 6 to 8 sacs abreast 

 at the broadest part of each gonad. Each gonad is turned over in the 4 principal radii and is 

 continuous with the mesentery. 



Preserved specimens are grayish or pale brown, semi-transparent, with a dark-brown 

 or nearly black streak at bell-margin. 



A number of specimens were found at Bering Island, one of the Commander Islands, 

 North Pacific, in summer. 



The species is well described and figured by Kishinouye (see text-figure 340). 



