19 



coxiy Pilsbry. Tho description in Pilsbry's paper would do 

 for lacTirymosa. 



In conclusion. — While all previous records of A. lachry- 

 mosa have been confined to about 150 yards of beach, on 

 Frederick Henry Bay, southern Tasmania, the writer was 

 able some time ago to extend its range to Sulphur Creek, 

 north-western Tasmania; and, more recently, Mr. May has 

 found it on Bruny Island, and now Mr. May and myself are 

 satisfied that it is con-specific with A. coxi, Pilsbry. .We 

 have the record of two specimens taken by the late^ Dr. Cox, 

 at Port Hacking, New South Wales, and, finally, Dr. Thiele's 

 specimen extends its range far into the tropics. 



Thus a species that has hitherto been considered one 

 of the most restricted in its range is found to have a most 

 extended range north and south, probably greater than any 

 other of our known specimens. It certainly appears very local 

 in its occurrence, the reasons for which must await further 

 elucd-dation. I have sent two specimens to Dr. Pilsbry, asking 

 him to kindly compare with his type of A . coxi, and advise 

 whether he can find any justification for retaining the Tas- 

 m.anian shell as a sub-species of A. coxi, Pilsbry. 



Note. — Since the foregoing was written I have received 

 Dr. Pilsbry's reply, which is as follows: — "I have carefully 

 compared the specimens of A. lachrymos'a, May and Torr, 

 with the type of A. coxi. I am satisfied that there is no 

 specific difference. A sub-specific difference may be indicated 

 by (1) the difference in colour, my form being pink within, 

 yours greenish; (2) the wider central areas of valves 3-8 in 

 my specimen. This is exaggerated in the figures, which were 

 done on stone by a commercial lithographer from my pencil 

 drawings." 



This fully confirms our opinion, and in face of the 

 variability of this species we are hardly justified in making 

 a sub-species of the southern form. A . lachrymosa, May and 

 Torr, is therefore a synonym of A. coxi, Pilsbry. 



The pitting of Callochiton platessa, Gould, var. fossa, nov. 

 (Proc. Bost. Soc. N.H., ii., 1846, p. 143.) 

 Some years ago I noted that one of the shells belonging 

 to this species, that I had collected in Gulf St. Vincent, 

 showed six deep pits, immediately in. front of the lateral area 

 of the seventh valve. On January 24, 1920, I collected a 

 second specimen in which the same valve shows a similar 

 number of pits. A few months back, when going through 

 the collection of the Polyplacophora in the South Australian 

 Museum, with a view to determining the species, I noticed a 



