198 Mr. G. A. Boulenger on Fishes 
These facts seem to me to make more than probable the 
supposition that at an earlier period the specimen had suffered 
evisceration without the visceral mass being completely 
detached. By the continuity of the ambulacral grooves of 
two of the arms of the normal disk with one of the grooves of 
the supernumerary disk a supply of food would be ensured to 
the latter without seriously curtailing that of the former during 
regeneration. In the paper just cited Mr. Dendy has shown 
in how short a time the visceral mass may be regenerated, 
twenty-one days being a sufficient length of time for regene- 
ration to become so complete that “there is little to distin- 
guish a regenerated specimen of this date from a normal 
Antedon except the small size of the visceral mass and the 
want of pigment upon it.” 
The abnormal character and displacement of the anus and 
the canal-like ambulacrum are not so easily accounted for ; 
but they are minor points, and do not appear to me to impair 
the value of what has been advanced above. 
EXPLANATION OF PLATE VIII. 
List of reference letters. 
a. Anus. g'. Gut of supernumerary disk. 
a.g. Ambulacral grooves. m. Mouth. 
ce. Abnormal ambulacrum., r.w.v. Radial water-vessel. 
c.w.v. Circum-oral water-vessel. s.d. Supernumerary disk. 
fp. Funnel-shaped projection of — s.o, Skeletal ossicles. 
supernumerary disk. w.t. Water-tubes. 
g. Gut. v. Ambulacral groove. 
Fig. 1. Oral surface of abnormal specimen of Antedon rosacea, X 5. 
Fig. 2. Aboral surface of abnormal specimen of Antedon rosacea, x 5. 
Fig. 3. Sagittal section through the normal and supernumerary disks, 
showing the point of union of the two, x 16. 
Fig. 4. Sagittal section of the supernumerary disk, passing through the 
mouth and anus, x 16. 
Fig. 5. Sagittal section of the supernumerary disk, showing the funnel- 
shaped projection traversed by the abnormal ambulacrum, x 16. 
XXX.—List of the Fishes collected by Mr. E. W. Oates in the 
Southern Shan States, and presented by him to the British 
Museum. By G. A. BOULENGER. 
THE collection made by Mr. Oates in a district previously 
unexplored, so far as Fishes are concerned, proves of great 
interest. It adds to our knowledge of the extension of species 
Studies from the Biological Laboratories of the Owens College, i. (1886) 
pp. 299-312. 
