No. 471] ANATOMY OF ACAL^A TESTUDINA LIS 175 



have not yet come under public discussion I have found myself 

 unable to adopt his views or to confirm his observations. It is 

 unfortunate that of Haller's four species three are incorrectly 

 named (cf. Willcox, : 00). One, ScntrlliNa qalathni, is in ail 

 probability an Acma^a but its specific name can only be MinniM'd; 

 for his two other Acmieas he employs the name i^otiia. a syMonyni 

 which was not only discarded by its author soujc sixtv years a(,'o 

 but which has been since 18G5 in use for another ^renus or sub- 

 gemis, so that the Lottia of Ilaller is an entirely different animal 

 from the Lottia of Carpenter and modern autliors in <jeneral. 



.1. ]ra(jiUfi. This paper dealing as it did entirely wiili |ircM rved 

 material which was studied almost exchisively by means of >c( ii<»ns, 

 left room for such completion and enlarocn'ient a> i. yvvM^u\v.\ in 

 the present work. Tn I'.IOl, nppc^arcd an excellent paper on the 

 anatomy of Lottia gic/atilca by W . K. Fi.>lier to wliidi I -hall fre- 

 quently have occasion to refer. The latest coniribniion an arti- 

 cle by Spillman in which (:05, ooi^-oO I. .li.s :)7_'i the heart 

 and vessels of Acma\i are described. 



Other papers which in the last decade ha\c .liMHsMd the Ac- 

 maMihe have l>een occupied mainly with cfiticisn. of M.me of ilal- 

 ler'. .lateincnt> and uith the presentation of counter oI.m rxations. 



a- distinct fro,,, the [cii'ardial. ncphri.lial. an.! ^ona.lial .axities, 

 the extent of the nepliri.liiitn. the pivsenee of a sul .i-a.lnlar organ. 

 The chief (hspntantshaNc l.e.-n Ilallei. l'eUr„eer. Thiele, Willcox. 



^Methods 



The first problem which faces any student of the Mollusca 

 relates to narcotization. This is a much less itnportant (juestion 

 among the limpets than in most other gronp> ■>\nvv the form of 

 the body is such that no great amount of distortion can b<" »'t!ected 



niantle'an.l tentacles aiv the main results to he attain..!. For 

 these purposes I have enipl..yed vari..us lu.-tho.ls Kps.nn salts, 

 cocaine, chloretone, stale sea water, fresh water. Xo one of these 



