j8 



bul dillers by its sborl, poinled terminal looth (PI. II, lig. 8 c), and as far alike tbat 

 of Ol. furciliferum Balz. The two lasl described forms of serrulae are only in points 

 of the slightest importance different from those found in Chelifer Geof. or not at 

 all different. The structural features, which may be observed in (iariiiiiniis nohilis 

 n. sp., are much more developed in an undescribed species of (iariijniuis Dad. from 

 Hawaii, as seen in fig. 2 p. 17. From this structure to that of Gaiypiis longidigitatiis 

 Rainb., the distance is not great; in this species we have the two basal teeth distinctly 

 longer than the following and enlarged towards their tips in a marked degree, 

 while the terminal one is completely free, directed obliquely forwards and pointed 

 (fig. 3 p. 17). This structure leads directly to the most remarkable modification of 

 the serrula, known in any of the Chelonethi, namely that found in (i. elegans Sim. and 

 G. irnigatiis Sim., in which the two basal teeth are much longer than the following 

 and singularly enlarged distally, the one i)artly covering the other with their 

 extremities (PI. II, figs. 2a & Ibj; the penultimate tooth is much longer than the 

 preceding ones, distally free and pointed; the terminal tooth is completely free, 

 pointed and directed obliquely forwards under an upwards curvature. Other 

 modifications of the simple type found in Olpiiim cordimanum Balz, may be 

 observed in Garypiis Floridensis Bks. and G. saxicola Wath. as seen in fig. 4 c, 

 pi. II. The serrula of the (Chelifer Geof. is as already stated only a modification 

 or a repetition of that of Ganjpimis nohilis n. sp.; the teeth seem most often 

 to be higher, and their number varies from less than 20 to 37 {Chelifer equester 

 With, 21. pi. VIII fig. 3cd'), apparently dependent on the size of the animal. The 

 terminal tooth, which is more or less free, and either pointed or blunt, but 

 especially the basal, which is distinctlj' the longest, enlarged terminally and here 

 provided with a difi'erently shaped, membranaceous flap, sometimes provides 

 systematic characters of value (PI. IV, figs. 2 a and 4 c). The serrula of Pseudochiri- 

 dium Thorellii n. sp. (PI. IV, fig. 12 c) has the teeth (16) comparatively higher and 

 the terminal, as well as terminal but one more independent than in the corre- 

 sponding organ in Chelifer Geof., the serrula of Chiridiiim Menge has a very similar 

 structure. 



The facts, «et forth regarding the structure of the serrula, bear out the 

 evidence, that the serrula in the members of the two suborders is always easily 

 distinguished from each other, for the difference is well marked in this respect 

 even between species of Ideoroncns Balz, and Olpiuiu L. K., which in other characters 

 bear similarity to each other; but they also show, that the similarity between forms 

 of the Pseiidobisiinae Hans, and the Garypidae Hans., is greater than that between 

 the latter and the other subfamilies of the Hemictenodactyli. It is also of interest 

 to notice, that the development of this organ as well as its generic and specific 

 variations, attained in the family of the Garypidae Hans., is unsurpassed. 



Lamina exterior. The lamina exterior is a plate-shaped organ, situated 

 along the outer margin of the immovable fingei- in all the Panctenodactyli, and 

 according to Hansen (49. p. 230), who only had observed il in Ibis suborder, of great 



