382 Mr. 0. Thomas on a 



tubercles are low and rougli and very numerous. Many of 

 the larger spicules extend the whole distance between two 

 adjacent polyps, and sometimes even exceed this length. They 

 fall into three groups, fairly distinct in shape : — (a) large 

 modified fusiform spicules, which taper more or less towards 

 the ends and measure from '9-3 mm. in length by "25-45 mm. 

 in breadth ; (b) squamous or scale-like spicules, often with 

 slightly lobed margins, which measure from "S-l"! mm. in 

 length by •4-*6 mm. in breadth ; and (c) large modified 

 squamous spiculeSj consisting of a flattened tuberculate basal 

 portion and of a projecting part which forms the projecting 

 spine of the verrucas. They measure, in length by breadth 

 in millimetres, as follows : — "7 X '5, '6 X '4, '5 X "3. 



In the polyps there are slender spindle-shaped and club- 

 sliaped spicules. They are often slightly curved and either 

 taper to both ends or are blunt and rounded at one end and 

 pointed at the other. Many of these exhibit fairly prominent 

 spines towards the thicker end. They vary considerably in 

 size, being from '3-*5 mm. in length and from •02-06 mm. 

 in breadth. They are found chiefly in the tentacles, where 

 they form an operculum to the retracted polyp ; but an incom- 

 plete and irregular crown or collar is formed by them at the 

 base of the tentacles. 



In colour the spicules vary from white to semitransparent, 

 while the whole colony has a whitish-brown appearance. 



This species differs from Acis pustulata in not having 

 violet- coloured opercular spicules and in the branches not 

 being compressed in the plane of branching. It also differs 

 from Acis orientalis in having the polyps on all sides of the 

 stem and branches and in the branching not being confined 

 to one plane. 



From the fact that it was collected in Ceylon waters I 

 propose to name it Acis indica^ to mark it as distinct from 

 Acis orientalis. 



Hah. Deep water off Galle, Ceylon. 



XLV. — A new Bat from the United States, representing the 

 European Myotis (Leuconoe) Daubentoni. By Oldfield 

 Thomas. 



The subgenus Leuconoe * has not been hitherto recognized 

 as occurring in North America, but Myotis yumanensis should 

 probably be regarded as a member of the group, although 

 not a strongly marked example of it. 



* Type, Myotis Daubentoni, the " Wasser-Fledermaus." 



