ON THE ANASPIDACEA, LIVING AND FOSSIL. 491 
ferous fossils, concluding therefrom that they all belonged 
to the same order and are very closely allied. 
In a subsequent paper (9) the same author amplifies and 
crystallises the views of Boas and Hansen on the classifica- 
tion of the Malacostraca, and proposes to do away with the 
order Schizopoda and to redistribute its component families, 
uniting the HKuphausiide with the Decapoda to form a 
division Hucarida, while the Eucopiide, Lophogastride and 
Myside are united with the Cumacea, Amphipoda and 
Isopoda as Peracarida. The Anaspidide are placed in a 
separate subdivision, the Syncarida, together with the three 
fossil forms mentioned above. 
Calman gives the following diagnosis of the three divisions: 
Division EKucarida.—Carapace coalescing dorsally with 
all the thoracic somites. Eyes pedunculate. Antennal pro- 
topodite with, at most, two distinct segments. Mandible 
without lacinia mobilis in adult. Thoracic lmbs flexed 
between fourth and fifth segments. No oostegites. An 
appendix interna sometimes present on pleopods. Hepatic 
ceca much ramified. Heart abbreviated, thoracic.. Sperma- 
tozoa spherical or vesicular, often with radiating appendages. 
Development, as a rule, with metamorphosis. 
Division Peracarida.—Carapace, when present, leaving 
at least four thoracic segments distinct. First thoracic 
segment always fused with the head. Antennal protopodite 
typically of three segments. Mandible with lacinia mobilis 
(except in parasitic and other modified forms). Thoracic 
limbs flexed between fifth and sixth segments. Oostegites 
attached to some or all of the thoracic limbs in female, form- 
ing a brood-pouch. No appendix interna on pleopods. 
Hepatic ceeca few and simple. Heart elongated, extending 
through the greater part of the thoracic region, or displaced 
into abdomen. Spermatozoa filiform. Development taking 
place within brood-pouch; young set free at a late stage. 
Division Syncarida.—Carapace absent. All the thoracic 
segments distinct. Eyespedunculate. Antennal protopodite 
of two segments. Mandible without lacinia mobilis. Thoracic 
