THi; ZOOLOGICAL STATION AT NAPLES. 



385 



the Mediterranean species agree with those of the Fi-ench coast described 

 by H. Milne-Edwards, Giard, and Lahille, and with our British species. 



I wished, therefore, to compare these published, but sometimes in- 

 sufficient, descriptions with living specimens from the original localities 

 in order to determine, if possible, the systematic positions of the species 

 and provide myself with figures and anatomical details for comparison 

 with British species. Fortunately, also, I found that Dr. Lo Bianco had 

 in his stores a few of Delia Valle's type specimens, or at least specimens 

 of these species identified and labelled by Delia Valle himself. These I 

 was permitted to draw and examine. In regard to the other species, of 

 which there were no authenticated specimens, I soon found that from the 

 large number of examples they laid before me I was able in most cases 

 to determine what form the original describer had before him. I then 

 made coloured drawings of that form and examined its anatomy to settle 

 to which modern genus it belonged, and samples of every species I 

 examined and drew were preserved foi' histological purposes. In this way 

 I hope I have secured the material necessary for an accurate comparison 

 of a number of the Mediterranean and British species. I have brought 

 back over thirty sheets of coloured figures, and Dr. Lo Bianco is sending 

 a collection of bottles to Liverpool. 



The following is a list of the species ' I examined and determined when 

 at Naples : — 



ASCIDI.E C0MP0SITJ3. 

 I. — Merosom ATA. 



Fam. 1. — DiSTOMiDiE. 



DistomuTii costce, Delia Valle 

 crystallinum, Ren. 

 pancerii, Delia Valle 

 Cystodytes deUa-cJdajue, Delia 



Valle 

 Distaplia magnilarva, Delia Valle 

 rosea, Delia Valle 



Fam. 2. — PoLYCLINIDiE. 



Circinalium coricrescens, Giard 

 Amarouciuvi roseu7u, Delia Valle 



crystallinum, Ren. 

 Aplidium gibbulosniii, Sav. 

 Fragarwm areolatum, D.Ch. 



Fam. 3. — Didemnid^. 



Didemmtm bicolor, V. Drasche 

 gelatinosum, Giard 

 cereum, Giard 



II. 



Leptoclimim maculatuni, M.-Ed w. 



cocci n e u tn , V. 



Drasche 

 perforatum, Giard 

 dentatum, Delia 



Valle 

 fulgens, M.-Edw. 

 candidiim, Delia 



Valle 

 commune, Delia 



Valle 

 gelatinosum, Giard 

 exaratum, Grube 



Fam. 4. — DiPLOSOMiDiE. 



Diplosoma crystallinum, Giard 

 Pseudodidemmim lister ianum, 



M.-Edw. 

 Astellium spongiforme, Giard 



-HOLOSOMATA. 



Fam. 1. — BoTBYLLiD.E. I Polycyclus renieri, Lamk. 



Botrxjllus tapetnm, Delia Valle ' Botrrjlloides lutemn, V. Drasche 



morio, Giard | 



aurolineatus, Giard j 



riibntm, M.-Edw. 

 gascoi, Delia Valle 



' To complete the record the few simple Ascidians which were brought to me 

 with the compound, and which I examined, have been included. 



1900. c c 



