514 Mr, D. Sharp and Mr. F. Muir on the Comparative 
Family PHALACRIDAE. 
Forms examined: Phalacrus grossus Er, Spain. Lito- 
librus obesus Sharp, Panama. Olibrus corticalis Panz., 
England. 
Figs. 83 and 84 Pl. LVI are Phalacridae. 
Phalacrus grossus (Pl. LXI figs. 83, 83a). 
Median lobe broad and flattened ; median orifice on dorsal face 
at apex; median foramen large. Tegmen forming a ring-piece. 
The “cap-piece” formed of the two flattened lateral lobes consoli- 
dated on the dorsal side to near their apices, and a large flat 
plate, turned down along the lateral edges, the basal corners 
meeting together on the ventral side of the median lobe, where 
the ring is asymmetrical. Internal sac large and complex. 
There is a pair of long tubular glands which open on the apex 
of the sac, one on each side of the opening of the ejaculatory duct. 
As our specimens were dried we could not examine the testes to see 
if these glands were extra, or if there were the usual ones having 
an abnormal opening. In Olibris corticalis these glands are not 
present in this position. 
Litolibrus obesus (Pl. LVI fig. 84). 
Median lobe broad and flattened, slightly bent near the base 
where a flange (a) runs along the dorsal face ; median orifice on 
dorsal aspect at tip; median foramen large, on ventral side of 
base. Tegmen forming ring-piece. Lateral lobes small, consoli- 
dated together and forming a pointed, flattened plate bearing a 
pair of small curved hooks ; basal-piece long and narrow on dorsal 
side, broadened at the base where it encircles the median lobe, 
having two deep emarginations causing the median central portion 
(6) to project as a tongue, Internal sac large, bearing a pair of 
double claws and a pair of small plates, as armature. 
Family MONOTOMIDAE. 
Form examined: Monotoma conicicollis Guér., England. 
Fig. 85 Pl. LVI. 
Monotoma conicicollis (Pl. LVI figs. 85, 85a). 
Median lobe short, broad, flattened, and slightly curved; 
median orifice at tip, the dorsal edge projecting beyond the ventral 
and pointed ; median foramen at base and of large size. From the 
ventral edge of the median foramen proceed two long struts (ms). 
