TUNICATA. 25 



PI,ATK III. 



Fifis. 1, 2 and 3. — Three specimens of Coiella euivyola, Tniustcdt, from the upper surface ; natural 



size. 

 Fio. 4. — Dorsal tubercle and anterior end of dorsil lamina ; slij,'litly enlarged. 

 Fir,. ;">. — Tentacles; X 4(i. 

 Fic. C. —Dorsal region of anterior end of branchial sac, showing tentacles, dorsal tid)ercle. 



epipharyngeal groove, dorsal langueis and branchial sac ; X 50. 

 Fk;. 7. — Mohjiila limlz/soni, from right side ; natural size. 

 Fiii. 8. — Body after removal of test, right side ; natural size. 

 Fk;. '.I. — „ „ „ „ „ left side ; natural size. 



Fic. 10. — Dorsid tubercle ; x ■'>•'. 

 Fir;. 11. — Part of branchial sac, from inside ; x .10. 

 Fio. 12. — Alimentary canal and gonad of left side ; slightly enlarged. 

 Fui. 13. — Alimentary Ciiiuil and gonads of both sides, from the ventral surface : siighily enlarged. 



I'LATI'; IV 



—Mol;i>ila hurra, right side ; natural size. 

 — ,, ,, left side ; natural size. 



—Part of branchial sac from inside ; x 40. 

 —Alimentary canal ; x about 2. 

 —Tentacles and dorsal tubercle, etc. ; x li>. 



Halonjnthin disi-nveryi, right side ; naUiral size. 

 —The same, left side, from a photogniph ; x 2. 

 —Part of dorsallamina, showing lauguets ; x 10. 

 —Another group of languets closer together ; x 10. 

 —Part of branchial sac, from inside ; X 4ii. 

 —One of the compound tentacles. 

 —The dorsal tubercle ; x 4o. 



I'LATK V. 



Fro. \ . — Jliih/nhi coiiromi/aiis, leftside, with Jlnlf/nhi loii;/ic'i)ilis, right side, adhering ; natnnd size. 

 Fio. 2.- Part of surface of test of M. rninnmiliins, showing the irregular hair-like prolongations 



with a few sand grains ; x to. 

 Fio. :i. — Base of sUilk of J/, lonffifaiilin, attached to right side of M. ciiiiniiinlniis ,• natural size. 

 Fio. 4. — if. amcomitans, removed from U.-st ; natural size. 

 Fio. &. - „ „ „ jart of branchial sac, from inside ; x lo. 

 Fio. 0. — „ „ „ dorsal tubercle ; x 4ii. 



Fio. 7. - „ ., „ one of the large mnch-branched tentiicles ; x I". 

 Fig. 8. — it. lonfficaiilin, removed from test ; natural size. 

 Fig. '.I. — „ „ part of mantle. 



Fio. 10. — „ „ part of branchial s;ic, from inside. 



Fio. 11. „ ., dorsal tniiercle ; X 4o. 



