APPENDIX A. 
SUPPLE]^IENTAEY EEPORT UPON THE ASCIDIH: SIMPLICES. 
Since the publication of the First Part of this Eeport in 1882, several specimens 
of Simple Ascichans belonging to the Challenger collection have been sent to me for 
examination. Some of these were found in the bottles at the Challenger office, while 
others had been returned by the naturalists who were working at other groups in 
which specimens of Ascichans had been accidentally included. One of these was 
a new species of the interesting genus Culeolus, and this reached me just in time 
to be noticed in Part I. (see p. 276). Another [BatJiyoncus discoideus) is a very 
remarkable specimen attached to a manganese nodule from deep water. This form and 
another smaller species {Bathyoncus minutus) may probably be referred to the genus 
Bathyoncus formed in the first part of the Eeport for the species Bathyoncus mirabilis, 
also an abyssal form. 
The remaining species described below have no very remarkable peculiarities, and 
they fall naturally into well-known genera. With the exception of a new species of 
dona from Japan, they all belong to the family Cynthiidae. 
Two species belonging to the “ Porcupine ” collection, which have reached me since 
the publication of the Eeport upon the Simple Ascichans of the “Lightning” and 
“Porcupine” Expeditions,^ are also included in this Appendix. One of them is a 
new species of Molgula, which has straight stigmata in the branchial sac, and therefore 
indicates a transition towards the Cynthiidse. 
Family Molgulid^. 
The following is an interesting newspecies of Molgula, which was obtained from a 
depth of 440 fathoms in the North Atlantic. 
Molgula carpenteri, n. sp. (PL XLVII. figs. 1, 2). 
External Appearance. — The shape is ellipsoidal or nearly spherical, and the body is 
not attached. The edges are rounded, and there is slight lateral compression. Both 
* Trans. Boy. Soc. Edin., vol. xxxii. part ii. p. 219, 1884. 
(ZOOL. CHALL. EXP. — PAET XXXVIII. — 1886.) 
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