2 Verm. 
VERMES. 
nous covering is subdivided in annulations. Structurally, Seison agrees best 
with the Rotatoria : a rudimentary rotatory organ, oesophagus, stomach 
(intestine indistinct, vent probably at the base of the tail), a masticatory 
apparatus (though placed in a peculiar pouch-like diverticle of the mouth), 
unicellular glands, muscles, no heart, and no blood-vessels, &c. ; but the 
contractile bladder and lateral canals are obsolete, the ejaculatory organ 
of the males very complicated, and the males themselves not inferior in 
size and structure to the females. If placed with the Rotatoria^ Seison 
therefore must occupy a separate position in the class. Two species are 
distinguished, S. grubii and S. annulatus (1). 
II. CH^TOPODA. 
1. Giard, a. Note sur I’embryogenie de la Salmacina dysteri, Huxley. 
Note sur le developpement, &c. C. E-. Ixxxii. pp. 233-235 & 
285-288. 
2. Greef, R, Ueber das Auge der Alciopiden. Ein Beitrag zur 
Kenntniss des Baues der Retina. SB. Ges. Marb. 1875, pp. 1-24, pis. 
i. & ii. (Abstr., Z. ges. Naturw. [2] xiii. pp. 301-303.) 
3. Grube, E. Mittheilungen fiber die Familie der Clilorhceminen. Ber. 
schl. Ges. 1876, pp. 37-49. 
4. Horst, R. Aantekeningen op de anatomie van Lumhricus terres- 
tris. (Tidschr. Nederl. Dierk. Ver. iii. pp. 37-68, pi. vi. [Separately, 
as Dissertation, 96 pp., 1 pi., litre tcht] ; Abstract, Niederl. Arch. 
Zool. iii. pp. 282 & 283.) 
6. McIntosh, W. C. On the Structure of the Body-wall in the Sj)io- 
nidw. P. R. Soc. Edinb. 1875 & 1876, pp. 12.3-128. 
6. . Descriptions of some new Species of Annelida from Kerguelen 
Island. Ann. N. H. (4) xvii. pp. 318-323. 
7. . On British Annelida. Pt. i. Tr. Z. S. ix. pp. 371-394, pis. 
Ixvii.-lxx. 
8. . On the Annelida of the Porcupine Expeditions of 1869 & 1870. 
L. c. pp. 395-416, pis. Ixxi.-lxxiii. 
9. Semper, C. Die Verwandtschaftsbeziehungen der gegliederten 
Thiere. Arb. Inst. Wurzb. ii. pp. 25-76, pis. iii.-v., and iii. pp. 
115-404, pis. v.-xxv. Preliminary account, “Die Identitat im 
Typus der Gliederwiirmer und Wirbelthiere,” Verb. Ges. Wiirzb. (2) 
ix. pp. 102-1 12 ; Ann. N. H. (4) xvii. pp. 462-473. 
10. Vejdowsky, F. Beitrage zur Oligochaetenfauna Bohmens. SB. 
bohm. Ges. 1875, pp. 191-201. 
11. . TJebev Psammoryctes umbellifer (Tubifex imA, E. R. Lank.) 
und ihre verwandte Gattungen. Z. wiss. Zool. xxvii. pp. 137-154, 
pi. viii. 
