Mr. J. Alder on the British Tunicata. 161 



apertures fringed with small filaments, might have belonged to 

 the same genus. The right ovary in that species is placed out- 

 side the intestinal llexure. 



Ascidia parallelogramma on the one hand and Molgula arenosa 

 on the other, form two links in the chain of affinities uniting 

 Ascidia and Cynthia, while each at the same time possesses 

 characters peculiar to itself. 



Genus Cynthia, Savigny. 



Savigny has divided Cynthia into four sections, which he 

 names Cynthite simplices, C. Ccesira, C. Styela, and C. Pandocia. 

 The first and third of these only are represented in the British 

 fauna, unless the second (containing one species only, C. Dione) 

 may be considered congeneric with the Molgula arenosa already 

 described. The fourth section * agrees in all respects with the 

 third, excepting in the position of the ovary, which is confined 

 to the right side of the body. The genus Dendrodoa of M'Leay 

 also possesses similar characters, but with ovaries on the left 

 side only. The form and position of the ovaries are very variable 

 in the genus Cynthia, and, though affording good specific distinc- 

 tions, can scarcely be considered of generic value. 



Cynthia squamulosa, n. sp. 



Body ovate or subglobose, of a pinkish hue, tinged with lilac, 

 attached by a broad base. Apertures a little apart, rather large 

 and conical, but not much produced ; the branchial one terminal, 

 the anal nearly so ; each margined and rayed with violet. Test 

 tough, smooth or slightly mammillated, covered with small scaly 

 plates marked with concentric lines. Tentacular filaments slen- 

 der, simply pinnate. Branchial sac with six folds on each side. 

 Ovaries forming a double, linear, perpendicular series on each 

 side, with a fimbriated mass of sperm-cells (?) between. Dia- 

 meter about half an inch. 



This species, which I first met with in Guernsey, in 1853, 

 where several specimens occurred on oysters dredged in about 

 fifteen fathoms, has since been sent me from Lulworth Cove by 

 my friend Mr. J. Gwyn Jeflfreys. It appears to be a southern 

 form. 



Cynthia rosea, n. sp. 



Body cylindiical, short, nearly as broad as high, adhering to 

 shells by a tolerably broad base. Apertures on large mammillae, 

 yellowish, with four double stripes of red, and covered with mi- 



* The Pandocia conchilega of Dr. Fleming (Brit. Anim. p. 468), the 

 generic character of which appears to be taken from this section of Savigny's 

 Cynthia, is probably referred to it by some mistake. 



