126 DIPLOPODA. 
9. Spheriodesmus saussurei. 
Spheriodesmus mexicanus, Sauss. & Humb. Miss. Sci. Mex., Myr. p. 21, figg. ]-le* (1872) (nec 
S. mexicanus, Sauss., 1859 and 1860). 
Spheriodesmus saussurei, Attems, Denk. Akad. Wien, lxviii. p. 891 (1900) *; Carl, Rev. Suisse 
Zool. x. p. 677, t. 12. figg. 100, 101 (1902) *. 
The typical examples of this species were provisionally referred by Saussure and Humbert to the young of 
S. mexicanus, although these authors pointed out that, in addition to being considerably smaller, they have 
the lobes of the fourth segment wider. On the evidence thus supplied Cook rightly supposed they would 
prove to be specifically, if not generically, distinct from S. mexicanus ; and two years later Attems, without 
seeing the specimens, proposed to give them the new specific name saussure?. The original examples were 
subsequently examined by Carl, who found no specific features to distinguish them from S. mexicanus 
apart from those mentioned by Saussure and Humbert and certain structural details in the phallopod 
and the first leg of the male. The tubercle at the base of the femur of the first leg in the male is 
lower than that of S. mewicanus, the apical portion of the phallopod is much shorter and ends in 
a simple point, and the exerescence on the upper side of the distal segment is larger and blunter. 
Length 16 millim., width 5. 
Hab. Mexico, Cerro de Escamela in the Eastern Cordillera. 
10. Spheriodesmus neglectus. 
Glomeridesmus mexicanus, Sauss. Mém. Soc. Phys. Genéve, xv. pp. 276-278 (1860) (in part.) °. 
Spheriodesmus neglectus, Carl, Rev. Suisse Zool. p. 676, t. 12. figg. 107, 108 (1902) *. 
According to Carl, Saussure originally confounded two species, a larger and a smaller, under the name 
Glomeridesmus mexicanus. Specimens of the smaller, regarded by Saussure as young, are pale in 
colour, aud have the keel of the fourth segment wider than in the larger one, S. meicanus. In the 
first leg of the male, moreover, the basal process of the femur is lower and the fourth segment is evenly 
curved above. The phallopod, too, is quite different, being shorter and stouter and lightly bent upwards 
at the apex, which is divided into two broad processes, an outer stout at the base and narrowed and 
bluntly pointed at the apex, and an inner which is apically truncate, with a rounded lobe above; near 
the middle of the upper surface there is a lobate process with convex edges, a sligtly constricted vase, 
and an attenuated apex. Other secondary sexual characters are not described. 
Length 24 millim., width 8. 
Hab. Mexico, Cordova }. 
11. Spheriodesmus medius. 
Spheriodesmus medius, Carl, Rev. Suisse Zool. x. p. 675, t. 12. figg. 105, 106 (1902)'. 
Colour yellowish-white (in alcohol). As in S. saussuret and S. neglectus, the keels of the fourth segment are 
wider than in S. meaicanus. 
The first leg of the male bears a long and sharp basal process on the base of the femur, and there is a 
much smaller process on the underside of the succeeding segment. The phallopod has no distinct 
hairy eminence on the proximal end of the basal segment, and the distal segment is elongate and 
semicircularly curved upwards, without any submedian process ; but the tip is somewhat strongly bifid, 
both prongs being concavo-convex and gradually attenuated apically. 
Length 20 millim., width 7. 
Hab. Guatemata (Oltramare cell.). 
