40 



rALri'OKNIA AIAUKMY ol" SCIKNCKS. 



somites x, xi iiiid xii, ciiiuu'ctiii<i tliu dorsal and vciitnil vessels. There are also 

 eoiiiiections lietwcen those two vessels in ix, x and xiii as in tlic other species, but 

 those fonncctioiis consist of rej^nlar secondary vessels narrow and tnhnlar, and in no 

 way resenililinii lioarts. Tlierc is no snhnenral vessel. The ventral vess(d is divided 

 in somite vi.and in llir aiitciini- six -uniites there is a heavy capillary system connect- 

 ir)g the ventral and dorsal vessels. 



Tn tile following I have endeavored to give a comparative tul)lc ot llic species 

 wliicli I refer to Di'/ldiiin. As far as concerns those species wiiich I have not myself 

 investigated the tal)le must be considered tentative, especially so in regard to the char- 

 acter of Z). f^<6i«, the description of which liy I'Ictclicr i< somewhal in>iifru;ieiit. 1 need 

 here hardly add that Ddtanln Poii/luni. is the species described from Maderia l)y Jied- 

 dard as Mlrrosrd/a.r. ponUoni. The description given for D.dnfnii is taken from Rosa's 

 description of Mlrroncok.t; dnhins Fletclier, and not from F'letcher's own. 



DELTANIA. 



Septal i/laiiih[ux 

 Sperm-nacn in 

 Spermalheca 



D. ekijans n. sp. D. Troycri n. sp. 



vi, vii, viii, ix. v, vi, vii, viii. 



xi, xii. X, xi. 



Very small aud Large, apiiit, with 

 pellucid. No di- 2 diverticula each. 

 j verticula. Opaiiue. 



The rtH</vti or inwer Only a little closer Only a little closer 

 w(<p in each couple together than the together than 

 exclusive of those set m of the outer those of the outer 

 in the genital re- couple. couple. 



gion, arc: 



/';-o.</«V(', thegland-jHelix-likc at the Not helix-like; tub- 

 ular part I top. Muscular ular, straight or 

 part nut very bent, 

 short. 



D. Bnihnmi n. sp. D. PouUoni Bedd. D. duhin Rosa. 



v, vi, vii, viii. Not present. 



xi, xii. xi, xii. xi, xii. 



Large, close togeth- Not present. Not present. 



er, with 2 diverti- 

 cula each. Opaijne 



Several times closer Several times clos- Several times clos- 

 together than er together than cr than the outer 

 those of the outer the outer conple.i couple, 

 couple. 



Oizzaril 



None. 



None. 



Not helix-like; tub- 

 ular and broad at 

 the base. Top en- 

 larged knob-like. 



None. 



None 



Helix-like at the 

 top. Muscular 

 part very short. 



Rudimentary. 



Divert!' iiln of the 

 apcrmatheca 



Absent. More than .J as large .Vbiuit i as large as 



as the spormathe- the spermathecal 

 cftl pouch. pouch. 



Two on each side. Two on each side. Two on each side. One on each side. Two on each side. 



Peninl selas 



X r ji h )■ id ill com' 

 niencc in 



Nephridio-poros in 4tli and .'Id setie. 

 front of and little Prominent in the 

 interior to clitellum. 



S/nrtniluctu 



4th and .'id sotie. 



4th and .Id sotiD. 



3d seta. M setie. 



Not prominent iu 

 the clitellum. 



Remain separatc^Uemaiu separate up Kemain separate up Keniain separate I'nite to form one 

 up to the atria. | to the atria. to the atria. up to the atria. lube on each side 



which opens in 

 the muscular part 

 of the atrium. 



I'l.sl.rii.rly to tin- 

 clitellum the setie 

 have regained their, 

 nornuil <listance in| 

 somite 



xxvi and xxvii. 



xxiii and xxiv. 



