1 CALIFOUMA ACADEMY OK SCIENCES. 



•1 Rliynchelmis Hoffm. 



One |)iiir receptacles in the eighth segment. A s(»litary albuminous ghiml 

 in the ninth segment. Tiie postscptal secondary vessels are simple, the preseptal 

 ones are feathered ami branched. Spines are entire. Cephalic lobe filiform.* 



3. Sutroa n. geu. 



Seminal receptacles con-sist of several pair.s of h^bes, entire or forked, which 

 ail open in the so-called albuminous gland in the eighth segment. A solitary 

 aUnuninous gland in the eighth segment. Preseptal and interseptal secondary dor- 

 sal vessel are branching and feathered. Postseptal vessels are gastric, not feathered 

 nor brandling. Spines simple, not forked. Cephalic lobe filiform. 



It will thus be seen that Sutroa is nearly allied to the two other genera of 

 the sub-family, the most prominent eharacteristic beiuu' the concentration of the 

 receptacles and their opening into the all)iiininoiis i;lanil. But the vascular system 

 also shows some great peculiarities, which will soon be fully described. 



As only one species is known of tlie genus Sufroa, the generic and specific 

 characteristics will here necessarily be considered together. 



Sutroa rostrata ii. j^en. et sp 



HubiVit. — 1 have t'ouinl this species only in .Mountain Lake, near the Marine 

 Hospital west of San i'"i'aiicisco. ( 'alironiia. It occurs here only on the north 

 shore, just at the mouth of a small spring, which empties into the lake. It 

 lives in the richest niml, between the roots of acjuatic plants, probably with the tail 

 vibrating in the water. When captured and set free in the water, the worms swim 

 ra[)iiily tiirough a peculiar wavy motion of the body, showing to advantage its 

 really magnificent iridescent colors, found to the same degree in uo other fresh 

 water annelide. The color of the body is ver}' similar to that of Mhijnchelinis limo- 

 sellii, a lively llesliv red. 



Tlie woi ni appears to be (juite rai-e. as 1 did not succeed in getting over a 

 dozen worm> during each excursion. It also seems quite restricted to a certain 

 part of the lake, where it lives in the rich mud at the margin ()f the bank. On 

 the soutii, east or West i']\t\:< of the lake I have looked for it in vain. 



The egg capsule or cocoon.s of Stitrva are in size nearly similar to those of 

 liltijitcltdmis, but in .■-hape dillerent. They can nearest be compared to the hanging 

 nests of some bird.s — small, bag-shaped bodies, with a fiat, somewhat concave top — 

 suspended by a long semicircular membrane. Figure 15 gives an enlarged repre- 



" Vujilovitliy, 1. u , piiy. Wi. 



