t6 
ZOOLOGY OF THE FAR EAST. 
specimens represent B. gracilis^ (Sars), as is apparent from Harmer's detailed des- 
cription and figures. 
Family URNATELUDAE. 
1915. Annandale, Mem. Ind. Mus. V, p. 127. 
In the paper cited I discussed the limits of this family, which I restricted provi- 
.sionally to the genera Urnatella, Leidy and Loxosomatoides , Annandale The dis- 
covery of a new genus that is evidently allied closely to the latter but yet has certain 
affinities with Myosoma, Robertson, makes it at any rate probable that Myosoma 
should also be included. The following key shows the more striking differences be 
tween these genera : — 
I. Stalk segmented, each segment heavily chitinized and 
capable of functioning as a resting bud . . . . Urnatella. 
II. Stalk not segmented. 
A. Aboral surface of both stalk and capitulum bear- 
ing scattered chitinous spines ; no chitinous 
shield on capitulum. Muscles of stalk entering 
capitulum . . . . . Myosoma. 
B. A chitinous shield, sometimes spiniferous, on abo- 
ral surface of capitulum only. 
1. Muscles of stalk nearly straight, com- 
pletely surrounding it, not entering 
capitulum . . , . . . Loxosorn,atoides. 
2. Muscles of stalk directed downwards and 
outwards from the capitulum, confined 
to oral and lateral surfaces of the 
stalk, meeting in the lower part of the 
capitulum with well-defined oblique 
capitular muscle-bands at an angle . . Chitaspis (nov.) 
With the exception of Myosoma,^ the species of these genera have been found 
only in fresh or brackish water. Urnatella is fluviatile and is only known from the 
neighbourhood of Philadelphia, U.S.A. Two species of Loxosomatoides-^ occur in 
lagoons and deltaic tracts on the east coast of India , while the new genus Chitaspis 
is represented by a species from a lagoon connected with the Gulf of Siam. Myo- 
soma was described from a species found in the sea on the Pacific Coast of North 
America. 
Chitaspis, gen. nov. 
This genus consists of Urnatellidae with unsegmented stalks and capitular 
shields Uke those of Loxosomatoides. The muscles of the stalk, however, emerge 
from the capitulum ; they are directed outwards and downwards and are confined 
I See Harmer, Siboga^Exp., mon. XXVIIIa, p. 27 (191 5). 
i Robertson, Proc. California Acad. Sci. (Zool.) II (3), p. 324 {1900). 
3 Auuaadale, Rec. Ind. Mus. II, p. 14 (1908) and Mem. Ind. Mus. V, p. 126 11915). 
