INSECTS. 267 
The male individuals amongst Insects have usually two testes, 
though there be occasionally only one, just as in the female there 
may be only one ovarium. Such is the case with Lithobius where 
the part has the form of a long tortuous canal. In the Scolopendre 
proper (Scol. morsitans, &c.) are different oval testes, much extended 
in length, (described improperly by Kurorca as epididymitdes) 
which at each pointed extremity send off an efferent canal; all these 
canals coalesce to form a single canal which is very tortuous and 
widens into a sac below (testiculus KurorcA!). In Scutigera there 
are two very tortuous canals (festicul’?) present, which begin with 
an oval sacciform expansion, and then pass into a single fine tube, 
of great length and winding right and left with close curves; this 
tube opens into a canal, which as an are connects the two efferent 
canals each of which dilates twice into an oval vesicle?. In Julus 
there are two long blind tubes, which, connected by transverse 
canals, have the form of a ladder, and to which laterally blind sacs 
are appended; these sacs may be considered to be testes and the two 
longitudinal canals to be vasa deferentia’. 
In the hexapod Insects the parts which prepare the seed are 
always in pairs. There is found indeed in most Lepidoptera and in 
certain Coleoptera (ex. gr. in Ophonus and Harpalus, genera of the 
family of the Carabic?) a single testis*, but since two efferent canals 
arise from its lower edge, it is obviously formed by the union of two 
appendages had been confounded together as secreting organs, Ann. des Sc. nat. I. 1824, 
p. 281. We owe to C. Ta. Von SIEBOLD the most complete investigation of this 
subject; see his Fernere Beobachtungen tiber die Spermatozoa der wirbellosen Thiere, in 
MuELLER’s Archiv. 1837, 8. 392—433. If, as VoN SIEBOLD assures us, the vesicula 
copulatrix only seldom contains Spermatozoa, and then usually dead ones, it is less to 
be wondered at that the experiments of Mauricut failed than that those of HUNTER 
succeeded; they ought to be repeated with better success with the fluid from the 
receptaculum seminis. LL&0N Durour still persists in considering all these appendages 
as glandes sébifiques. ; 
1 §. Kurorea, Scolopendre morsitantis Anatome, Petropoli, 1834, 4to. pp. 10, T1, 
Tab. 1. figs. 3—5; Rymrer JongEs in Topp’s Cyclop. 11. p. 413, fig. 201. 
2 Lion Durour, who has given a description and figure of these parts, considers 
the first pair of these vesicular expansions as festes; the tortuous canals as vesicule 
seminales, Ann. des Sc. nat. 11. 1824, p. 97, Pl. v. fig. 3. 
3 See figures in Topp’s Cycloped, Ul. p. 551, (article Myriapoda, by RyMxEr 
Jones) and by STEIN in MUELLER’S Archiv. 1842, Taf. xul. figs. 17, 18. 
4 Lion Durour, Ann. des Sc. nat. VI. p. 133, Tab. Vi. fig. 8 of Harpalus ruficornis 
(copied in Wa@ner’s Icon. Physiol. Tab. xx. fig. 8). 
