92 DR. COLLINGWOOD ON THIRTY-ONE 



A very handsome active species, crawls rapidly, at the same time throwing hack its 

 head, and floats, hack downwards, on the surface of the water. One specimen only, found 

 under a stone, and upon a small grey incrusting sponge, between tide-marks in Singa- 

 pore Harbour, west of the town, December 3rd. 



I have named this species after my friend Mr. Busk, than whom no one has been 

 more assiduous or successful in his investigations among the lower forms of Inver- 

 tebrata. 

 Fig. 6 : a, animal at rest, dorsal surface ; b, head. 



7. Eurylepta Kelaartii, Coll. 

 Length - L % inch ; breadth J inch. 

 Body small, smooth, thin. 

 Tipper surface mottled dark purple, the mesial line presenting a slightly elevated ridge 



of a darker colour. 

 Tinder surface the same colour as the upper, but paler. 

 Head small, with minute ear-like processes. 

 Eye-spots minute, roundish. 



An actively crawling creature, occasionally throws its head back. Two specimens 

 were found in Singapore Harbour, west of the town, under stones, and apparently feeding 

 upon a small incrusting sponge. One of these specimens was of a lighter lake colour. 

 December 3rd. 



As out of the 19 species delineated by Dr. Kelaart I have referred no less than 11 to 

 the genus Eurylepta, while of my own 12 this is the sole one of that genus, I have 

 dedicated it to him — a compliment to his memory whicb his industry in this as well as 

 in other branches of zoology well deserves. 

 Fig. 7 : a, animal in motion ; b, eye-spot, magnified. 



8. Typhlolepta Byerleyana, Coll. 

 Length f inch ; breadth f inch. 

 Body smooth, thin, and the lateral parts very ample and puckered. 



Tipper surface beautifully marbled with light-brown rings, including roundish spaces of 

 a whitish colour, smaller rings being between the interstices of the larger ; most 

 crowded and darkest in colour along the median bine, paler and more delicate 

 towards the sides. 

 Under surface of a pale grey, the dendritic marking in the centre of an opaque white. 



This very beautiful species I obtained from under a piece of coral on Pulo Barundum, 

 off the west coast of Borneo. Not having a brush at hand, I had great difficulty in dis- 

 lodging it from the crevices. Its movements were very contorted, and it did not exhibit 

 much activity. One specimen only was procured, October 6th. 



I have named this elegant species after my friend Mr. J. Byerley, F.L.S., of Seacombe, 

 Cheshire, a gentleman who in the hardly-spared intervals of active practice has ex- 



