Mr. J. Lubbock on two new species of Calanidae. 121 



anomalous in being attached to the back "instead of under- 

 neath. The tube which was in the act of escaping from the 

 male still retained its contents, which agree with Siebold^s 

 description. Using his nomenclature and letters of reference, d 

 is the expelling matter (matiere expulsive), e the glutinous sub- 

 stance (matiere glutineuse), and c the zoosperms (zoospermes) . 

 I have already remarked that of a large number of females which 

 I examined, four only were provided with one of these append- 

 ages ; this is probably owing to their having been collected in 

 the middle of June. Mr. Darwin^s specimens of L. Darwinii 

 having been caught in November, which answers to our May, 

 would account for my never having found a fully developed sper- 

 matic tube in that species, and the only time that Dr. Baird ever 

 met with a tube attached to Diaptomus was in October. 



As, owing to an accident happening to the vessel in which his 

 specimen of Diaptomus was contained. Dr. Baird says, he was 

 " prevented from making any lengthened observations on it,^' and 

 as I have heard of no one else who has studied the subject, I 

 believe my observations are the first which fully confirm those 

 of Von Siebold. The manner in which the three substances 

 contained in the tube act in Pontella is probably the same as in 

 Diaptomus. Jurine says, " il n^est pas rare d'en trouver avee 

 deux, trois, quatre, meme cinq tubes spermatiques colles autour 

 de la vulve ;" I, however, nev'er met with a female, either of P. 

 Bairdii or L. Patagoniensis, which had more than one tube. This 

 mode of fecundation, which Siebold has truly observed, is one 

 of the most remarkable phsenomena in the animal kingdom, has 

 now been observed in Diaptomus Castor, Labidocera Patagoni- 

 ensis, Pontella Bairdii, Calanus hyperhoreus (see the figures given 

 in Gaimard's ' Voyage en Scandinavie '), and it probably occurs 

 also in L. Darwinii and Anomalocera grandis, n. s., because in 

 these species, as in the P. Bairdii, I have found in the posterior 

 part of the cephalothorax, an organ which I am nearly sure is a 

 spermatic tube in the course of formation, so that it will most 

 likely be found to prevail throughout the whole family. The 

 shape of the tube varied in the different specimens of the same 

 species. Since the male orifice is situated between the second 

 and third abdominal segments, as in Cyclops, it is evident that 

 the inner branch of the left posterior leg in the male is not a 

 true penis. The delicacy of the structure of this branch appears 

 to indicate that it possesses the sense of touch in a high degree. 

 I have already noticed the curious relation which appears to exist 

 between it and the prehensile spine. 



Length about ^. 



Hab. Lat. 18" 15' S., L. 2° SC W. to 4° E. 



From the Museum of the College of Surgeons. Collected by 

 Sir E. Home. 



Ann. ^ Mag. X. Hist. Ser. 2. Vol. xii. 9 



