REPORT ON THE STOMATOPODA. 95 



the fourth and fifth. The outliue of the carapace is about as before, except that it is 

 uow deeply emarginated 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, I'l. VIII. 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 tbat 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 weU developed. The space between the lateral and the 

 intermediate spines of the telson is now equal 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 imj^ortant changes are the lengthening of the hind body, the 

 flattening and widening of the abdomen, and especially the -ft-idening 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 sul)median 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 Alimse, especially Aliraa hidens, 

 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 

 w'ere from Cape Howe and its vicinity. 



Alimerichthus. — Inasmuch as the Erichthns t}^e of Stomatopod larvae presents a very 

 much greater diversity of forms than the Aliraa 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 Evichthus type, and that the greatly elongated Alima; 

 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 scjaarated, 

 Claus has pointed out that among the Alimw themselves there is a series of larvae, 



