302 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Fig. 103 is tho sketch of a section through one of these small cysts; the longer diameter of the 
blastocyst is 0.19 mm., the shorter 0.15. The blastocyst is surrounded by a line granular coat, 0.007 
mm. thick, with a few retractile bodies. This coat in turn is closely invested with a thin covering of 
connective tissue 0.003 mm. thick. Concentric layers of connective tissue arranged somewhat loosely 
lie outside of this and are very abundantly supplied with nuclei. The latter layer is about 0.038 mm. 
thick where the layers are most crowded, and 0.055 mm. where more open. Outside the concentric 
nucleated area the connective tissue is normal, with few nuclei. Those cysts lie in the submucosa. 
Ascaris clavata Kudolphi. 
[Plato 43, figs. 105-108, U. S. N. H. No. 0532.] 
About 50 specimens were collected July 14 from the stomach of a pollock ( PoUachius virents) by 
Prof. 11. M. Kelly. I have obtained this species frequently in former years from the cod and twice 
from the pollock, although my notes on tho species have never been published. Diesing’s synopsis of 
the species is: 
“Head with two linear posteriorly decurrent ahe; mouth with large rounded lips. Body 
anteriorly very much attenuated, moderately inflected; caudal extremity of the male inflected with 
mucronate tip; copulatory spines arcuate.” 
The following characters adapted from von Liustow’s description are added, being in close 
agreement with what I observe in these specimens : Head and tail ends inflected. Upper lip extended, 
the pulp cylindrical, somewhat narrowed in tho middle, two roundish projections on tho inner side. 
The anterior border and the basoof the upper lip are of equal size and equal to half of the greatest 
breadth. The two papilla) are small and situated far toward the front. Tho oesophagus measures 
one-fourteenth of tho body length. The intestine continues in front, where it springs from the 
oesophagus into a caecum 1.8 mm. in length and lying beside the oesophagus, while the latter likewise 
continues posteriorly in a c:ecum which lies beside the intestine and is of equal length with the first 
caecum, but only half as broad. The male is 45 mm. long (see below) and 1 mm. broad, the tail 
measuring jgy of tho body length; the tail end is sharpened to a point, its extreme end being beset 
with little brilliant elevations; the cirri measure 2.2 mm. and are thus relatively long. There 
appear to be 27 preanal anti 6 postanal papillae. Tho female has a length of 70 and a breadth of 
4.3 mm. ; the tail is bluntly conical, with somewhat diminished tip; it equals of the body length. 
The foregoing description agrees well with the individuals under consideration, except that 1 
find the length of my specimens falls short of the dimensions given by von Linstow. The largest 
females measured 60 and the largest males 40 mm. in length. 
In one specimen, a male, examined with some care, the (esophagus was about ono-tenth of the 
body length. Tho cephalad prolongation of the intestine at its juncture with the oesophagus was seen 
distinctly; tho caudad prolongation of tho oesophagus was also made out, but less clearly. The 
character of the cirri is exactly that given by von Linstow. The upper lip presents some differences 
from the above description, the pulp being somewhat clavate in shape and relatively broader near 
the anterior end than indicated in von Linstow's ligure and description. The lip is also relatively 
shorter and broader. The papilla) were not studied very closely in this lot, but so far as they could 
be determined in a specimen seen in lateral view, they agreed in number and position with published 
descriptions of the species. 
Ascaris habena sp. nov. 
[Plate 43, figs. 109-115, U. S. N. M. No. 0533.] 
On September 5, eight nematodes were obtained from stomach and intestines of two specimens 
of toad-fish ( Ojpsanus tail). I have seen this species often in previous years at Woods Hole, in this host. 
Body tapering gracefully from near the posterior to the anterior end; jaws prominent, each with 
lateral membranes and two papilla), rhomboidal but rounded anteriorly, pulp expanding toward tip 
and becoming broadly club-shaped and two-lobed, each armed with four horny teeth. Tail somewhat 
variable in preserved specimens, short conical or even truncate, sometimes mucronate at tip, that of 
males shorter than females. Minute lateral wings are present at anterior end, though they were not 
noticed until transverse sections were made. The cuticle generally is smooth, but transverse stria), 
0.01 mm. apart, were noticed near tho posterior end in one case. The posterior end exhibits a strong 
tendency to curve ventrally in the females as well as in the males. In fact, more success was had in 
straightening the males than the females in tho killing fluid. The greatest diameter, especially in the 
case of the females, is near the posterior end. 
