REPORT ON THE TUNICATA. 1 Ml 



anterior end of the pyriform and moderately rapacious stomach (PL XXV. figs. 2 and 3, st.). 

 The intestine emerges from the more globular posterior end of the stomach, and stdl 

 runs posteriorly for a short distance, and then, having reached the posterior end of the 

 mantle, turns abruptly on itself from the right to the left side (PI. XXV. fig. 3, i.), and runs 

 anteriorly in close contact with the stomach and oesophagus. It then with a slightly undulat- 

 ing course continues as the rectum (PI. XXV. figs. 2 and 3, r.) up to the atrial aperture. 



The genitalia (PL XXV. figs. 2 and 3, g.) form a single lobed mass covering the 

 posterior half of the stomach and the commencement of the intestine, but not extending 

 into the loop. The ducts course along the dorsal side of the intestine, and terminate 

 like the anus just inside the atrial aperture (PL XXV. figs. 2 and 3, g.d.). 



One specimen of this species was obtained between Juan Fernandez and Valparaiso, 

 at Station 299; December 14, 1875; kit. 33° 31' S.. long. 74° 43' W.; depth, 2160 

 fathoms; bottom temperature, 1°"1 C; grey mud ; and two specimens, one considerably 

 injured, were obtained between the Cape of Good Hope and Kerguelen Island, at Station 

 146; December 29, 1873 ; kit. 46° 46' S., long. 45° 31' E.; depth, 1375 fathoms; bottom 

 temperature, 1°'5 C; bottom, globigerina ooze. 



Corella, Alder and Hancock. 



Ascidia, 0. F. Miiller, Zoologia Danica, vol. ii. 1780. In part. 



Ascidia, Forbes and Hanley, British Mollusca, vol. i. 1853. In part. 



Ascidia, Alder, Observations on British Tunicata, Ann. and Mag. Nat. Hist., ser. iii. vol. ii. 



1863. In part. 

 Corella, Hancock, On the larval state of Molgula, &c, Ann. aud Mag. Nat. Hist., ser. iv. voL 



vi. p. 362. 1870. 

 Corella, Kuptfer, Jahresber. der Commiss. 1875. 



Corella, Traustedt, Oversigt over de fra Danmark, &c, Ascidias Simplices. 1880. 

 Corella, Traustedt, Vestindiske Ascidiae Simplices. 1881. 



Body attached, sessile. Branchial aperture eightdobed, atrial sixdobed. 



Test cartdaginous, but soft and semi-transparent. 



Branchial Sac not.longitudinally plicated. Internal longitudinal bars present, 



but not papillated ; stigmata curved; fine longitudinal vessels coiled 



spirally. 

 Dorsal Lamina represented by languets. 

 Tentacles simple. 



Viscera placed upon the right side of the branchial sac. 

 Genitalia situated on the intestinal Loop. 



The species forming the genus Corel!", although now universally admitted to be very 

 distinct from those of Ascidia, were included in the latter genus until within the lasl 

 twelve to fifteen years. 



In 1863 Alder pointed out the more important characteristics o£ Ascidia parallelo- 



