o82 SUMMAEY OF CURRENT RESEARCHES RELATING TO 



either on the third or fifth appendage, while the primitive Theraphosid 

 spiders have two saccules and two outlets : one corresponding to the 

 third and the other to the fifth appendage. In these groups the coxal 

 glands appear to be quite homologous, but the Solif ugas possess in addition 

 a secreting sac, and the outlet is on the second appendage, not far from 

 the mouth, so that the gland acts as a salivary as well as an excretory 

 organ, and also possibly as a poison-gland. The coxal gland of the 

 Solif ugae is homologous with the salivary gland in Peripatus. The coxal 

 glands of other Arachnids are homologous with the large nephridia of 

 Peripatus on legs four and five. 



€• Crustacea. 



'Discovery' Hyperiidea.* — Dorothy A. Stewart reports on the 

 pelagic amphipods of the group Hyperiidea, collected in tropical and 

 sub-tropical waters by the ' Discovery.' She records an entirely new 

 genus, Hemiscehis, and two new species of Vihilia. The new form, 

 Hemiscelus diplochelatus g. et sp. n., closely approaches Schizoscelus 

 ornatiis Claus, but the possession of a subcheliform first gnathopod 

 serves to distinguish it. Another point of difference is the absence of 

 the pocket-like slit on the first joint of the sixth leg, which is so 

 characteristic a feature of Schizoscelus. The new form approaches 

 Euscelus in the shape of the gnathopods, and Schizoscelus in the general 

 form of the urosome and telson. It is probably between the two. 



Larval Development of Rock Lobster.-f — E. L. Bouvier describes 

 the hitherto unknown " puerulus " stage of Palinurus vulgaris. This 

 is the stage between the last Phyllosoma-stage and the final form. A 

 single specimen was found by the naturalists at Plymouth. It has not 

 the flattened body of the Phyllosoma, nor the long spider-like legs, nor 

 the large cephalic shield ; it has taken on the Macruran form. It 

 swims not by the setiferous exopodites of the limbs, as the Phyllosoma 

 does, but by its pleopods. An interesting figure of this new larval 

 form is given. 



Maturation and Spermatogenesis in Cyclops. J — Robert Chambers, 

 jun. has studied the maturation of the ovum in Cyclops americanus, 

 C. parens, and C. brevispinosus, and the spermatogenesis in the first of 

 these. In regard to maturation he found that the oogonial and sperma- 

 togonial chromosomes are diploid in number. The tendency for the 

 chromosomes, both of the oocyte and the spermatocyte, to assume a 

 characteristic U -shape seems to be subordinated, during the prophase 

 of the first maturation division, to a force which causes them to assume 

 a more or less rigid rod shape, somewhat swollen at the ends. In the 

 oocyte this massing of chromatin at the ends leaves a clear area in the 

 middle of the chromosomes. This cross-bar or clear area in the Cyclops 

 chromosome, when present, does not always lie in the middle, but may 

 be nearer one end than the other. Such a clear area does not occur in 



* Ann. Nat. Hist., xii. (1913) pp. 245-65 (4 pis.). 



t Comptes Rendus, clvii. (1912) pp. 457-63 (1 fig.). 



X Univ. Toronto Studies, Biol. Ser., No. 14 (1912) pp. 1-37 (3 pis. and 3 figs.). 



