CLASSIFICATION OF THE TUNIC ATA. 631 



Leptoclinum candidum, Sav. (Eed S., Med.) 



L. Lacazii, Giard. ("N.W. Eur.) [Vas deferens has only 2 or 3 turns.] 



L. maculatum, M.-Edvv. (N.W. Eur., Med.) [Vas def. has 12 turns.] 



L. marginatum, v. Dr. (Med.) 



L, coriacetim, v. Dr. (Med.) 



L. gelatinosum, M.-Edw. (N.W. Eur., Med.) 



L. granulosum, v. Dr. (Med.) 



L. asperum, M.-Edw. (N.W. Eur., Med.) 



L. dentatum, D. Valle. (Mecl.) 



L. cxaratum, Grube. (Med.) 



L. tridentatum, t. Dr. (Med.) 



L. durum, M.-Edw. (N.W. Eur., Med.) 



L. perspicimm, Giard. (N.W. Eur.) 



L. perforatum, Giard. (N.W. Eur.) 



L. totiga, Herdm. (S. Pac.) 



L. Moseleyi, Herdm. (Mai.) 



L. speciosum, Herdm. (S. Atl.) 



L. annectens, Herdm. (S. Atl.) 



L. tenue, Herdm. (S. Pac, N. Atl.) 



L. propinqiium, Herdm. (Mag.) 



L. ncglcctum, Herdm. (?) 



L. albidum, Verr. (E. N. Am., Atl.) 



L. luteolum, Verr. (E. N. Am.) 



L. subflavimijJIerdm. (A.Arct.) 



L. Jcffreysi, Herdm. (A. Atl.) 



L. Carpenteri, Herdm. (?N. Atl.) 



L. Tkomsoni, Herdm. (? N. Atl.) 



L. Edwardsi, Herdm. (S. Atl.) 



L.japojiicicm, Herdm. (Jap.) 



L. Jac/csoni, Herdm. (Austr.) 



L. rubicundii7}i, Herdm. (A. Arct.) [Colour yellow to rust-brown.] 



Tetradidevinum gigas, D. Valle. (Med.) 



Eucmlmm parasiticum, Giard. (N.W. Eur.) 



EuccELiUM, Savigny, 1816. 



Colony thin, incrusting ; common cloacal apertures visible, 

 slit-like. 



Test filled witli markedly stellate calcareous spicules. 



Mantle thin and transparent. 



Ascidiozooids with the branchial aperture circular or imper- 

 fectly lobed ; atrial small, indistinct. 



Branchial sac with 6 rows of stigmata. 



Alimentary canal with a small swelling on the intestine behind 

 the stomach. 



The only species that with certainty belongs to this genus is 



LINN. JOUEN. — ZOOLOGY, VOL. XXIII. 45 



