40 CALIFORNIA ACADEMY OF SCIENCES. 
somites x, xi and xii, connecting the dorsal and ventral vessels. There are also 
connections between those two vessels in ix, x and xiii as in the other species, but 
those connections consist of regular secondary vessels narrow and tubular, and in no 
way resembling hearts. There is no subneural vessel. The ventral vessel is divided 
in somite vi, and in the anterior six somites there is a heavy capillary system connect- 
ing the ventral and dorsal vessels. 
In the following I have endeayored to give a comparative table of the species 
which I refer to Deltania. As far as concerns those species which I have not myself 
investigated the table must be considered tentative, especially so in regard to the char- 
acter of D. dubia, the description of which by Fletcher is somewhat insufficient. I need 
here hardly add that Deltania Poultoni is the species described from Maderia by Bed- 
dard as Microscolea: poultoni. The description given for D. dubia is taken from Rosa’s 
description of Microscolex dubius Fletcher, and not from Fletcher’s own. 
DELTANIA. 
x — === 
D. elegans un. sp. D. Troyerin. sp. D. Benhamin. sp. D. Poultoni Bedd. D. dubia Rosa. 
Septal glands in vi, vii, vili, ix. Vv, Vi, vil, viii. Vv, vi, vii, viii. Not present. 
Sperm-sacs in nah BON Xx) oxd. xi, xi. xi, xii. xi, xii. 
Spermatheca Very small and Large, apart, with Large, close togeth- Not present. Not present. 
pellucid. No di- 2 diverticula each. er, with 2 diverti- 
verticula. Opaque. cula each. Opaque 
The ventral or inner Only a little closer Only a little closer Several times closer Several times clos- Several times clos- 
sefe in each couple, together than the together than together than er together than er than the outer 
exclusive.of those setw of the outer those of the outer those of the outer the outer couple.) couple. 
in the genital re- couple. couple. couple. 
gion, are: 
Prostate, the gland- Helix-like at the Not helix-like; tub- Not helix-like; tub- Helix-like at the 
ular part top. Museular ular, straight or ular and broad at top. Museular 
part not very bent. the base. ‘Top en- part very short. 
short. larged knob-lke. 
Gizzard None. None. None. None. Rudimentary. 
Diverticula of the Absent. More than }as large About 4 as large as 
spermatheca as the spermathe- the spermathecal 
cal pouch. pouch. ~ 
Penial sete Two on each side.) Two on each side. Two on each side. One on each side. Two on each side. 
| 
Nephridia com- ii. ii. | ii. | ii. v. 
mence in 
2 aa j | - ; 
Nephridio-pores in/4th and 3d setw.| 4th and 3d sete. | 4th and 3d sete. 3d setie, 3d setae. 
front of and little) Prominent in the) Not prominent in 
interior to clitellum. the clitellum. 
Spermducts Remain separate Remain separate up Remain separate up|Remain separate Unite to form one 
up to the atria. | to the atria. | to the atria. | up to the atria. tube on each side 
| which opens in 
the muscular part 
of the atrium. 
Posteriorly to the  xxvi and xxyii. Xe | XXxl. Xxili and xxiv. 
clitellum the sete | 
have regained their 
normal distance in | 
somite | 
