31 
Acotyleans it is known to characterize only one species, Enterogonia 
pigrans Haswell, the single representative of an aberrant genus. 
As only a single specimen was collected, it is advisable at pre¬ 
sent to desist from an opinion about an eventual commensalism. 
The find might perhaps be of a casual nature. 
Discostylochus parcus n. g. n. sp. 
The single specimen of this new Stylochid was collected at 
Hilo, Hawaii, in March 1915, underneath C olob ocentr otus atratus L. 
Fortunately it is sexually mature, 
and its greatest breadth is 10 mm. 
The shape of the body agrees 
in a splendid way with that gene¬ 
rally met with in the genus Stylo- 
chus. The broadly expanded and 
nicely rounded anterior end is pho- 
tographically reproduced on Plate 
II, Fig. 1. The posterior half of the 
body narrows slightly and is con- 
sequently not so well rounded as 
the half-circular anterior end. The 
body is firm and consistent as in 
most Stylochids and rather thick 
(Plate II, Figs. 2 and 3). 
During preservation the body has 
become bent, contracted, and folded 
in a way characteristic to the species 
of Stylochus. The vigorous muscu- 
lature and the firmness of the body 
are the causesforthe particular State 
of contraction so very often met 
with in Museum materials of that genus. In his valuable monograph 
on the Stylochines, Meixner, has given a couple of characteristic 
pictures (1907, Taf. XXVI, Figs. 1 & 2) of this condition. It 
certainly causes a great deal of trouble in the determination and 
diagramming of preserved Stylochids and makes it more or less 
difficult to construct an exact figure of the entire animal and to 
obtain a properly cut series of longitudinal sections. 
It measures in length 14 mm. 
Text-fig. 8. Discostylochus parcus 
n. g. n. sp. The animal in ventral 
aspect. As all the diagrams, this is 
drawn with the help of Abhe’s 
camera. m, mouth; pr, prostate ve- 
sicle; ut, masses of eggs in the uterus. 
