22 



LoRiCELLA ANGASi, H. Adams and Angas. 

 (Proc. Zool. Soc, 1864, p. 193.) 



In my paper on the above genus (Trans. Koy. Soc. S. 

 Austr., vol. xliii., 1919, pp. 59-65) reference is made to the 

 "finger-like processes" being noticeable in the anterior portion 

 of the girdle, and the ''spear-head spicules" being set opposite 

 them and apparently having some relation thereto. In 

 January, 1920, I collected a very well-preserved specimen at 

 Marino, South Australia, which was free from the usual 

 foreign growth. In this specimen, which is 60 mm. in 

 length, the finger-like processes of the girdle extend right 

 round, and the remarkable "spear-head spicules" are placed 

 opposite these, right round the girdle. In a letter, dated 

 October 17, 1921, Mr. S. Stillman Berry, of Hedlands, Cali- 

 fornia, writes me in answer to a letter of mine referring to 

 some remarks that had been made in reference to these strange 

 spicules on Loricella: — "I have worked on those Loricella and 

 Kopionella spicules just enough to know that I want to go 

 into the matter of their structure a great deal more 

 meticulously, which will mean a lot of work in the preparation 

 of slides and so on. I cannot understand how anyone can 

 interpret chiton setae as algae." 



DESCRIPTION OF PLATE III. 



Fig. la. Acanthochiton mayi, Ashby, portion of median valve. 



Type. 

 16. ,, ,, ,, median valve. Co -type. 



X abt. 13 times. 

 2a. „ shirleyi, Ashhj, portion of posterior valve. 



Type. 

 26. ,, ,, ,, portion of median valve. 



Type. 

 2c. ,, ,, ,, median valve. Co-type. 



X abt. 11 times. 



3. „ gahrieli, Ashby, portion of median valves 



showing longitudinal striae in dorsal 

 area. Type, 



4. Callochiton platessa, var. fossa, Ash by, portion of 7tli 

 valve showing pits. 



