FISH PAKASITES COLLECTED AT \V()()|)S lloLE. 303 



In a female measuring 3b' mm. in length tin- o-sophagns \\iis ti mm. in length. 



The anal papillae in a male were made out to have the following arrang< -nu in : There an- 28 

 papilla' on c-ach side, 121 preanal aud 1 postanal. The postanal papilla- arc very small. Tin; posterior 

 4 preanal papilla- a. re also very small. These are preceded l>y I of medium si/e, and these again 1>\ 

 Hi large, prominent papilla-. While the number appears to be the same DII tbe two sides, those <m 

 right side extend a little farther forward than those on left. The spicules not made <>ui clearly. 



Dimensions in millimeters of alcoholic specimen in acetic acid, side view: 



(1) Of a male; length 29, length of head 0.1 I, diameter of head (>. 14. diameter ;, mm. hack of head 

 0.2li, diameter at middle of body length 0.66, diameter 5 mm. from posterior end o.77, diameter at anal 

 aperture 0.14, length of tail 0.07. 



(2) Of a female; length 42, length of head 0.22, diameter of head 0.22, diameter 5 mm. back of 

 head 0. It!, diameter at middle of body length 0.95, diameter 5 mm. from the posterior end I.:.; diameter 

 at anal aperture 0.33, length of tail, 0.115. 



Acaiithocheilus uidifex sp. nov. 

 [Plate 4!i, figs. 110-1 19, tj. S. N. M. t)5:;. ] 



( >n August 11 and 19, large uematodes, with minute, inconspicuous jaws, were, found in the, 

 stomach-wall of the tiger shark (Caleocerdo liyrinux), which appear to belong to an undcsi rih. -d 

 species. The body tapers from a short distance in front of the middle to the anterior end, while it is 

 of nearly uniform si/e from the middle to near the posterior end, plump and smooth, the cuticle 

 crossed by faint transverse stria'. Head minute, three-lobed. Since in some cases three small lobes 

 could be seen distinctly, while in others the three-lobed character of the mouth is not so plainly 

 shown, it would appear that the worm has the power of retracting these oral lobes. Two minute 

 conical papilla-, with their points directed forward, could be made out on one of the lobes of a small 

 specimen. A large specimen, when viewed from the ventral side in acetic acid, showed two papilla- 

 plainly on each of the lateral lobes. The aperture of the mouth is very minute and is turned a little 

 toward the ventral side. The tail is rather slender conical, and about equals in length the diameter 

 of body at anal aperture. Lips of anal aperture in large females rather prominently rounded. 



The anal papilla- were not made out with entire satisfaction. A specimen was prepared in the 

 following way: After staining, the dorsal portion of the posterior end was cut away and the ventral 

 portion spread out ou a slide, ventral side, uppermost, and mounted in balsam. In some way the post- 

 anal part was lost, so that only the preaual papilla- are shown. These are arranged in a double ro\\ 

 on each side of the median line. On the left side the arrangement is regular, aud eight pairs, or sixteen 

 single papilla', were counted. On the right side, while about the same number of papilla- were counted 

 they were not arranged so regularly as on the left side. They were, however, in two rows, as on the left 

 side. The walls of the intestine are much folded, especially toward the posterior end. A branch of tin- 

 intestine extends forward from the base of the (esophagus and lies beside that organ. The thickness 

 of the cuticle is about 0.05 mm. The ova, with which the uterus of the specimen sectioned was 

 crowded, were 0.04 mm. in diameter, with a transparent, non-staining envelope, surrounding a granular 

 mass which stains strongly in alum carmine; the diameter of this mass is about 0.028 mm. 



Dimensions of a large female (alcoholic) in millimeters: Length 125, diameter of head 0.21 

 greatest diameter of body 2.5, diameter at anus 0.78, length of tail, 0.78. In another of the same 

 length the diameter iu front of the anus was 0.57 and the length of the tail O.u'J. In a small specimen 

 also a female, 35 mm. in length, the length of the (esophagus was 1 mm. 



These worms occur in crypts or uests, for the most part in the submucosa of the stomach. In 

 the lot collected August 11 they were iirst noticed as hard cyst-like places in the stomach wall. 

 When these were cut into the worms were liberated. There appeared to be a male and female, at 

 least a large and a small worm, together in most cases. Two of the crypts were lined with a continua- 

 tion of the stomach epithelium, which had apparently closed over the point of entrance from the 

 interior of the stomach. Iu one case the worms lay between the two muscular coats of I he stomach 

 wall. One small specimeu was free in the stomach, aud one largo one was found along with the 

 viscera, but since the head of the shark had been cut oil' before 1 examined it for onto/.oa, these 

 uematodes may have been liberated by the decapitation, the plane of which passed through the anterior 

 end of the stomach. The specimens were not inclosed in cysts of connective tissue. 



In the shark examined on August 19 uiy attention was attracted to these worms by noticing in 

 the mucous membrane of the stomach, which had been carefully washed, that there were a few uema- 



