1.">S CAMl'OUMA ACADK.MY OF SCIENCES. 



the center of the tubercle. The most interesting; feature, however, consists in the 

 presence of throe or four arciform niiisciilnr hands which connect the opposite sides 

 of tlie tuhercuiar i)r()jectii)n, ami wiiich, ol (•(Mirse, serve tn further pu>h out tlio tip 

 of tiu- luliercle, oi' to icla.x it, as the occasion may demand. Tliese hands are entirely 

 conlined to llic ciitLllMr cell hiyer, and |)eMetratc to the very cuticle, to which at least 

 .some of the museles are attaciied, while others seem attached to the cells themselves. 

 Besides these epidermal arciform muscles, there are numerous co-lomic arciform 

 muscles, which also penetrate the glandular layers and serve to cor)nect the two sides 

 of the clitellum on either side of the tubercula pubertatis (fig. 138). While the 

 arciform muscles of the epidermal layer have been described by Cerfontaine in Lum- 

 bricus, they arc by no means known from many species. Their presence varies con- 

 sidcnibly in dilTerent species of Spargauophilus, but they are especially numerous 

 and strong in this one. 



Q£snj)hagiis and intestine. As regards the general shape of the alimentary canal 

 T can see no marked difference in the various species so far examined. Again as to 

 structure I find two points worthy of mention. The chloragogen cells which are 

 everywhere covering the intestine are much larger and more numerous in this species 

 tliau in Sp. Benhmni, covering as they do both tubular and sacculated intestine- 

 Aiiotiier point is the absence of a continuous blood-sinus. A continuous Mood-sinus 

 in the sacculated Jntestine has been described by J.ciiham in .S/v. taiiuais, by Smith in 

 Sp. Eiaou and is also found in tip. JJeuIiaiiii, as will be recorded further on. In this 

 species, Sp. Smithi, the sinus is not quite continuous, the respective blood lacunes are 

 quite close and in places run together, but they are nowhere continuous in the .same 

 way as in the species referred to above. The sacculated intestine commences in xiii. 



Spermathecw (fig. loO). The most characteristic feature of Spart/annphi/tis 

 Smithi is the occurrence of numerous speiinatheca' in at least three somites, while in 

 one somite there is fouml only one pair. Seven adult specimens from Laguna Puerca 

 were opened and agreiMl in the I'ollowing arnuigcincnt and niinibcr of sptTuialliecsB: 



Somite vi: 2 spermathec;e, in front of or slightly dorsid to setu' ;i and 4. 



Somites vii, viii, ix: 8 spermathcca* in each, in front of, slightly dorsal and 

 lateral of setse 3 and 4. 



The locniioM of these sperraathecte is not strictly constant as in .some specimens, 

 as well as in some somites of the same specimen, the spermatheca* were shoved a little 

 dorsally or ventrally of setic 3 and 4. One specimen possessed three spermathecir 

 on one side and four on tin; other sidi' in the .same somite, but all the other s|)ecimens 

 po.s.ses.sed eight spermathecje in each oi the somites, except in vi where invariably 

 only one pair was found. 



These spermathecie are very large (fig. 125), tall and slender, and viewed 

 in cros-s-sections of their body they are seen to extend from one end of the ccelom to 

 the opposite side, touching both body-walls. They arc generally directed forward 

 and cnjwding each other; they occupy nearly all ot the availabb- room in the somite. 

 I believe there is no other case known in oligoclneta where so many and so large 

 spermathecje are known to occupy the same .somite. The size of the res[)ective sperm- 



