CLASSIFICATION OF THE TUNICATA. 569 



Gonad single, placed ou the left side, anterior to the iatestinal 

 loop. 



Tliis genus contains the single species Eugyriopsis Lacazei, 

 E-oule, from the shores of Provence. 



The following Molgulids cannot, on account of the very im- 

 perfect descriptions which have been given of them, be placed in 

 any of the tables. Probably most of them belong to the genus 

 Ilolgula; several may be synonyms, or young conditions of 

 other species : — 



M. Uhulosa, Rathke. (N.W. Eur.) 



M. inconspiciia, Stimps. (Austr.) Only 4 branchial folds ? 

 M. inconspicua, Aid. & Hanc. (N.W. Eur.) 6 branchial folds. ' 

 M. sordida, Stimps. (E. N. Am.) 

 M. prodiKta, Stimps. (E. N. Am.) 

 M. arenosa, Stimps. (E. N. Am.) 

 M. 'pannosa, Verr. (E. N. Am.) 

 M. retortiformis, Verr. (E. N. Am.) 

 M. Uttoralis, Verr. (E. N. Am.) 

 M. papulosa, Verr. (E. N. Am.) 

 M. piMaris, Verr. (E. N. Am.) 

 M. pelliicida, Verr. (E. N. Am.) 

 M. labecuUfera, Stimps. (China.) [? Ascidiidas.] 

 M. conchilega (?). 



Ccesira parasitica, Macd. (Austr.) 

 C. ficus, Macd. (Austr.) 7 branchial folds. 

 C. pelhicida, Macd. (Austr.) 

 M. siphonata. Aid. (N.W. Eur.) 

 M. adhmrens, Giard. (N.W. Eur.) 

 Lithonephrya decipiens, Giard. (N.W. Eur.) 

 Gymnocystis comosa, Giard. (N.W. Eur.) 

 Eugyra arenata, Verr. (E. N. Am.) 



Pamily II. CTNTHIIDiE, Lac.-Di^th., 1877. 



Body usually attached, rarely free, sometimes pedunculated. 



Test membranous or coriaceous, rarely cartilaginous or covered 

 with sand. Branchial aperture usually 4-lobed, atrial 4-lobed. 



Branchial sac longitudinally folded; internal longitudinal 

 bars not papillated. Stigmata straight, never forming spirals. 



Tentacles simple or compound. 



Intestine on the left side, only slightly, or not at all, attached 



to the mantle. 



41* 



