TUNIC AT A. 



PI, ATK III. 



FIGS. 1, 2 and :!. - Three specimens nf ( 'nrrllu nuni/fita, Traustidt, from the upper suif.iee: natural 



size. 



Fn;. 4. IKirsul tulierele and anleriur cud of dorsal lamina ; slightly enlarged. 

 Fn;. 5. Tentacles; X In. 

 FIG. (',. Dursal region (if anterior end of branchial sac, showing tentacle-, dorsal tub'Tcle. 



epipharyngcal groove, dorsal languets ;tnd branchial sac ; x 50. 

 Fn;. 7. Mul;//i//'i lim/i/toiii, from right side ; natural size. 

 Fn:. 8. Body after removal of tot, right side ; natural si/.e. 

 Fir;. '.). left side ; natural size. 

 Fn;. 10. Dorsal tubercle ; x ">n. 

 FII;. 1 1. Part of liranehial sae, from inside ; X 50. 

 Fn;. li'. Alimentary canal and goiiad of left side ; slightly enlarged. 

 FII;. l:i. Alimentary canal and gonads of both sides, from the ventral surface ; slightly enlarged. 



PLATE IV. 



Fn;. 1. Jlol'/iiln liiii-cn, right side ; natural size. 

 FIG. i'. ,, leftside; natural size. 



Fn;. 3. Part of branchial sac from inside ; x 40. 



Fn.. 4. Alimentary canal ; x about 2. 

 FIG. 5. Tentacles and dorsal tubercle, etc. ; x 4(i. 

 Fn;. i;. Halocynthia discoveryi, right side ; natural size. 

 Fn;. 7. The same, left side, from a photograph ; x 2. 

 FIG. 8. Part of dorsal lamina, showing languets ; X JO 

 FIG. 'J. Another group of languets closer together ; x 



FIG. in. Part of branchial sac, from inside ; X 40. 



FIG. 11. One of the compound tentacles. 



FIG. 12. The dorsal tubercle ; X 4(>. 



I'LATI-; V. 



FIG. 1 . Miili/i/hi rniifiiiniliinx, leftside, with Jllolfft'la 1oH;/irnnli.i, right side, adhering ; natunil 



FIG. 2. Part of surface of test of J/. coi-t>niiftt>ix, showing the irregular hair-like prolongation.-, 



with a few sand grains ; x I". 



Yic,. ;',. Base of stalk of J/. luiiifii-nnlix, attached to right side of J/. i-inii-niii /"//.?. natural r\/.>'. 



FIG. 4. J/. i-ii>ii-<iiitnx, removed from test ; natural size. 



FIG. 5. ,, part of branchial sac, from inside ; x -l'. 



FIG. 0. dorsal tubercle : x 4n. 



FIG. 7. ,, ., ., one of the large much-branched tentacles ; x In. 



FIG. 8. M. lii/ii/ii-n/i/ix, removed from test ; natural size. 



FII;. '.i. part of mantle. 



Frii. In. part of branchial sac, from inside. 



FIG. 11. ., dorsal tubercle ; x 4n. 



