174 Miscellaneous. 



" Max Sehultze (Koll. und Sieb. Zeitschrift, vol. iv. p. 187) men- 

 tions that sperm atopliores exist in the Oligochaeta as in the Leeches. 

 Budge, in 1850, inTroschel's ' Archiv' (Wiegmann's), described the 

 sexual organs of Tuhifex rivulorum, with which he confused, as 

 appears from his figure, a Limnodnlus, describing parts of both 

 worms. He figured the bodies from the spermatic reservoirs, but 

 roughly. Leuckart, in his notice of this paper (Bericht, 1848-53), 

 states his belief that the bodies are spermatophores, and the pouches 

 spermatic receptacles. 



" D'Udekem, who observed filaments in the spermatic pouches of 

 iVrt?s prohoscidea, considered them as destined to aid in forming the 

 egg-capsule, but subsequently agreed with Leuckart that they were 

 probably spermatophores (Bull. Acad. Belgique, 2ud ser. tome xii.). 



" D'Udekem also describes two ' hard pieces ' at the male genera- 

 tive orifice in Chcetor/aster Midleri, which are apparently ' genital 

 set*.' He describes the generative organs of yEolosoma in probably 

 an imperfect state. 



" I am indebted to Professor Leuckart for these references." 

 I remain, Gentlemen, 



Truly yours, 

 January 26, 187L E. Rat Lankester. 



Abdominal Sense-organs in a Fly. By Dr. A. 8. Packaiid, Jan. 



"While engaged in naming a collection of microscopic preparations 

 of insects mounted on slides by Mr. T. W. Starr of Philadelphia, for 

 the collection of Dr. T. d'Oremieulx of New York, my attention was 

 drawn to a sense-organ situated on the female anal appendages of a 

 species of Chrysopda, allied to C. ornata (Say), a genus of flies 

 allied closely to Lepiis. The female appendages are rounded, some- 

 what spatulate, and of the usual form seen in other species of the 

 genus. The appendage is covered with stiff coarse hairs, about 

 fifty in number, arising from conspicuous, round, clear cells, while 

 the whole surface, as seen under a Zentmayer's ^^ (A eye-piece), 

 is densely covered with minute short hairs. On the posterior edge 

 of the tipper side of each appendage is situated a single large round 

 sac, with the edge quite regular. Its diameter is equal to a third 

 of the length of the appendage on which it is situated. Dense fine 

 hairs, like those covering the appendage, project inwards from its 

 edge. The bottom of this shallow pit is a clear transparent membrane 

 not bearing any hairs. There are no special sense-organs on the 

 antennae of the same insect. 



With these organs, which I suppose to be olfactory in their func- 

 tion, may be compared a very similar single sac situated on the 

 under side of the end of the labial and maxillary palpi of a species 

 of Perla, mounted on a slide in the same collection. Its diameter 

 is nearly half as great as the palpal joint itself. Instead of being 

 depressed, the sac in Perla is a little raised, forming a slightly 

 marked, flat tubercle, which is round, slightly ovate, under a -^ 



