CHiKTOGNATHA, ANNULATA. 
Verm. 1 1 
arranged in bundles, but in lamellae, and there is very considerable 
resemblance to what is found in the Cculenierata ; myoblasts are to be 
looked for in the epithelium of the coelom. The gastrula is of the 
typical character, and, before its disappearance, part of the endoblast gives 
rise to the first elements of the generative organs. The following system 
is proposed 
I. — Sagitta. 
Unpaired caudal ; two pairs of lateral fins. 
II. — Spadella. 
Unpaired caudal ; one pair of lateral fins. 
On Sagitta pontica, see Ulianin, Zool. Anz. iii. p. 588. 
Laugerhans (55) distinguishes three genera: — 
I. — Sagitta. Body delicate, two pairs of accessory jaws, and two pairs 
of free lateral fins. S. magna^ sp. u. 
II. -^Krolinia, g. n. {nec Quatrefages). Body delicate, one pair of 
accessory jaws, and one pair of free lateral fins. K. hamata^ Mobius. 
III. — Spadella, g. n. Body compressed, subcutaneous tissue greatly 
developed, and extending as far as the single lateral fin, two pairs of 
accessory jaws. The species cephaloptera, Busch, draco, Krohn, gallica, 
Paganstecher, and hatziana, Griard, fall into this genus. 
ANNULATA. 
47. Blomfield, J. E. The general features of the Development of the 
Spermatozoa, in the Vermes, Mollusca, and Vertehrata. Zool. Anz. 
iii. pp. 65-G7. 
48. . On the Development of the Spermatozoa, i. Lumbricus. 
Q. J. Micr. Sci. xx. pp. 79-89, pis. vi. & vii. 
49. Bourne, A. G. On the Structure of the Nephridia of the Medi- 
cinal Leech. Q. J. Micr. Sci. xx. pp. 283-302, pis. xxiv. & xxv. 
50. CosMOVici, L. C. Glandes genitales et Organes segmentaires des 
Annelides Polychetes. Arch. Z. exp^r. viii. pp. 233-372, pis. xix.- 
xxviii. 
51. Grube, E. Mittheilungen fiber die Familie der Phyllodoceen und 
Hesioneen. JB. schles. Ges. Ivii. pp. 204-228. 
52. Hatschek, B. Protodrilus leuckartii. Eine neue Gattung der 
Archianneliden. Claus’s Arb. iii. pp. 79-93, pis. vii. & viii. 
53. Hinde, G. j. Annelid Jaws from the Wenlock and Ludlow forma- 
tions of the West of England. J. G. Soc. xxxvi. pp. 368-378, 
pi. xiv. 
54. Joseph, G. Ueber Enchytrmus cavicola, sp. n. Zool. Anz. iii. 
pp. 358 & 359. 
55. Langerh\ns, P. Die Wurmfauua der Madeira, iv. Z. wiss. Zool. 
xxxiv. pp. 86-143, pis. iv.-vi. 
