162 Transactions. 



Echinoneus cyclostomus Leske. 



A single, specimen, denuded of spines, was found under stones in rock- 

 pool. 



Zoca%.— Meyer Island (29/2/1908). 



Distribution. — Australia, Kingsmill Islands, Zanzibar. 



Fibularia australis Desmoulins. 



A large number of this little urchin was obtained. Most of them are 

 dried and denuded tests, but there are five in alcohol. They vary in length 

 from 6 mm. to 13 mm. ; the largest has a breadth of 11 mm. and a height 

 of 4-5 mm. 



Locality. — Sunday Island ; dredged in 5 to 10 fathoms. " Dead tests 

 washed up on the beaches in plenty ; live ones rarely dredged on sandy 

 bottom, in Denham Bay." 



Distribution. — Australia, Sandwich Islands, Kingsmill Islands, Japan. 



Brissus carinatus Lamarck. 



The material at my disposal consists of one large broken individual and 

 a smaller denuded juvenile test. The larger one measures. 72 mm. in length : 

 the other dimensions cannot be given. The postero-lateral ambulacrum is 

 24 mm. in length, the antero-lateral 21 mm. The subanal fasciole is trans- 

 versely elongated, heart-shaped. 



The colour is uniform purplish-brown. 



Mr. Oliver writes, " One live specimen was encountered under a large 

 stone in a rock-pool at Meyer Island, but unfortunately was broken by the 

 crowbar in moving the stone." 



The smaller individual, which was washed ashore on Denham Bay beach, 

 is white, having evidently been bleached. There are only a few spines 

 remaining. In outline is recalls Agassiz' figure of Platybrissus rather than 

 Brissus. It is regularly ovoid, rather narrower posteriorly. The anterior 

 end is rounded when seen in profile, and the posterior end is higher than the 

 anterior, and nearly vertical. There is no keel, which may be due to its 

 youth. 



Length, 25 mm. ; breadth, 18 mm. ; height, 13 mm. The greatest 

 height is at about the level of the posterior ends of the hinder ambulacra : 

 the greatest breadth is nearly at the middle of the animal's length. The 

 lateral margins of the test are nearly parallel. The apical area is near the 

 anterior end, about one-quarter of the total length. 



The 4 ambulacra are only slightly sunken ; the antero-lateral nearly at 

 right angles to the middle line, slightly curved backwards at first, then 

 outwards and forwards. 



The poriferous zone is nearly of the same width throughout. The form 

 of the peripetalous and subanal fascioles is similar to that in the larger 

 specimen. There are some large tubercles at the anterior region of the 

 abactinal surface. 



It appears from Bell's study of the species (1879) that it is highly 

 variable ; and he j^oints out that Agassiz' figure of B. carinatus contradicts 

 his text in regard to the relative lengths of the antero- and postero-lateral 

 ambulacra. 



I am not sure that this is the juvenile form of B. carinatus, but my 

 literature is insufficient to enable me to trace out its identity. 



