1903.] ON THE ANATOMY OF A NEW GEPHYREAN WORM, 29 
Prate III. 
Fig. 1. Barbus progenys, p p. 2A, 7 5. 
2. Barbus batesii, p. 25, 3 B 
Prats IV. 
Microsynodontis batesii, p. 26. 
a. The whole fish, natural size. 
6. Mouth, x 2. 
ce. Skeleton, natural size. 
d. Upper view of skull, shoulder-girdle, and nuchal shield, x 1}. 
e. Side view showing air-bladder and anterior part of vertebral column, X 2. 
f. Left transverse processes of coalescent anterior vertebrae, X 3. 
PLATE V. 
Mev 1. Anabas pleurostigma, p. 27, &. 
Mastacembelus sclateri, p. 28, ‘natural size. 
On the Anatomy of the Gephyrean Phascolosoma teres, 
n.sp. By W.K. Hurroy, M.A., M.B., Senior Demon- 
strator of Anatomy in the University of Glasgow. 
[Received November 6, 1902. ] 
(Plates VI-VIII.’ & Text-figure 9.) 
Some time ago, while engaged in dredging-operations in the 
Firth of Clyde, Dr. J. F. Gemmill obtained two specimens of the 
Gephyrean worm figured in Plate VI. fig. 1. These he handed 
over to me, and at his suggestion I undertook the task of 
identifying them. My examination having led me to the con- 
clusion that I was dealing with an animal hitherto undescribed, 
it seemed advisable to give some account of its anatomy; and 
this I have essayed to do in the following pages. 
Unfortunately the presence of sand in the alimentary tract, 
no less than the leathery nature of the animal’s skin, formed an 
almost insuperable obstacle in the way of obtaining continuous 
series of sections: as a result, my account is in some respects 
incomplete. The worm was dredged from a depth of 60 fathoms, 
nine miles to the south-west of the Corsewall Light. The bottom 
was fine mud. 
External Characters and Integument. 
The worm is shaped like a very long-necked Florence oil-flask 
and measures 40 mm. in length. Since, however, in both indi- 
viduals examined the introy ee was almost completely i invaginated, 
in order to estimate the true length probably 8 mm. must as 
added to this figure. The body of the worm is seen (Plate VI. 
fig. 2) to consist of three portions which differ externally, and are 
found upon dissection to have definite relations to the contained 
viscera. 
First, occupying the anterior third or more of the animal’s 
1 For explanation of the Plates, see p. 40. 
