REPOET OX THE STOMATOPODA. 
95 
the fourth and fifth. The outline of the carapace is about as before, except that it is 
now deeply emarginatecl on the middle line. The posterior border of the telson is slightly 
emarginated ; the submedian spines have approached each other, and the intermediates, 
which are now much larger than the seven secondary dentations, have moved backwards, 
as have also the laterals. 
In the next stage (No. 5, PI. "VTII. fig. 1) more important changes have taken place. 
The third, fourth, and fifth thoracic appendages are represented by buds, and their 
somites have become reduced in length, so that the sixth is as long as all three of them. 
The abdomen is now much wider than the thorax, and its somites all end posteriorly 
in acute spines. The labrum is a little further back, and the anterior end of the carapace 
narrower than at stage 4, but the telson is essentially like that of stage 4, although it 
is a little more emarginated in the middle line. In stage 6 (fig. 2) the labrum is still 
further back, the flagellum of the second antenna and the appendages of the third, 
fourth, and fifth thoracic somites are elongated, and the latter are obscurely divided into 
joints ; the appendages of the sixth, seventh, and eighth thoracic somites are represented 
by buds, the abdomen is wider and more depressed, and the appendages of the sixth 
somite are parallel but well developed. The space between the lateral and the 
intermediate spines of the telson is now ecpial to the space between the intermediate and 
the submedian, and the posterior border is deeply notched on the middle line. In the 
oldest larva in this series (No. 7, fig. 3) the appendages all have essentially their adult 
forms, and the more important changes are the lengthening of the hind body, the 
flattening and widening of the abdomen, and especially the widening of the sixth 
abdominal somite and the anterior end of the telson. This is now nearly rectangular, and 
deeply notched on the middle line ; the submedian spines are more approximated, and the 
intermediates further back. 
Although the collection contains no specimens which serve to connect this larva with a 
specific adult, its close resemblance to the more typical Alimas, especially Alima bidens, 
gives every reason for believing that it is the young of one of the higher multicarinate 
species of the genus Squilla. 
The specimens are all from the coast of Australia, and all these which were drawn 
were from Cape Howe and its vicinity. 
Alimerichthus. — Inasmuch as the Ericlithus type of Stomatopod larvae presents a very 
much greater diversity of forms than the Alima type, and as it is preceded by a Erich- 
thoidina stage which is absent in the Alima larvae, there can be no doubt that the latter type 
is a secondary modification of the Ericlithus type, and that the greatly elongated Alimse 
like Alima gracilis (PI. VI. fig. 3) are more divergent from the primitive larva than the 
shorter and broader forms like Alima macrophthalma (PI. VIII. fig. 3). Although Milne- 
Edwards and Dana have attempted to show that the two types are sharply separated, 
Claus has pointed out that among the Alimas themselves there is a series of larvae, 
