Vv HOPLOCARIDA—STOMATOPODA Iq! 
thoracic legs inside, while the abdomen is pushed out through 
an opening of the Pyrosoma case behind, and by its alternate 
flexion and extension drives the boat forwards, the water being 
thus made to enter at the front aperture and supply the female 
and her brood with nourishment. 
DIVISION 3. HOPLOCARIDA. 
The carapace leaves at least four of the thoracic somites 
distinct. The eyes are pedunculate. The mandibles are without 
a lacinia mobilis; there are no oostegites, the eggs being carried 
in a chamber formed by the maxillipedes. The hepatic caeca 
are much ramified, the heart is greatly elongated, stretching 
through thorax and abdomen, with a pair of ostia in each 
segment. The spermatozoa are spherical, and there is a compli- 
cated and peculiar metamorphosis. 
Order. Stomatopoda. 
The Stomatopoda are rather large animals, occasionally reach- 
ing a foot in length, all of which exhibit a very similar structure; 
Squilla mantis and S. desmaresti are found on the south coast of 
is A a 
AC ee 
\ 
A.1 E Cc 
Fic. 98.—Lateral view of Squilla sp., x 1. A.1, A.2, 1st and 2nd antennae; Ad.Z, 
Ist abdominal segment ; 4.6, 6th abdominal appendage ; C, cephalothorax, con- 
sisting of the head fused with the first five thoracic segments; #, eye; JM, 2nd 
maxillipede ; 7, telson. (After Gerstaecker and Ortmann.) 
England not very frequently ; but they are very common in the 
Mediterranean, living in holes or in the sand within the littoral 
zone of shallow water, They differ from all the other Mala- 
