. The Cambridge natural history. Zoology. FiQ. 280. â Prosopi- sioma punctifrons, nymph. France. (After Vayssiere.) o, Orifice of exit from respiratory cliamber. of other Ephemerid nymphs. This point and other details of the anatomy of this creature have been described in detail by Vayssiere.^ These nymphs have a very highly developed tracheal system; they live in rapid watercourses attached to stones at a depth of three to six inches or more under the water. Species of Prosopistoma occur in Europe, Madagascar, and "West Africa. According to Eaton/ in the nymphs of some Ephemeridae the re
. The Cambridge natural history. Zoology. FiQ. 280. â Prosopi- sioma punctifrons, nymph. France. (After Vayssiere.) o, Orifice of exit from respiratory cliamber. of other Ephemerid nymphs. This point and other details of the anatomy of this creature have been described in detail by Vayssiere.^ These nymphs have a very highly developed tracheal system; they live in rapid watercourses attached to stones at a depth of three to six inches or more under the water. Species of Prosopistoma occur in Europe, Madagascar, and "West Africa. According to Eaton/ in the nymphs of some Ephemeridae the rectum serves, to a certain extent, as a respiratory agent; he con- siders that water is admitted to it and ex- pelled after the manner we have described in Odonata, p. 421. The internal anatomy of the nymphs of Ephemeridae shows some points of extreme interest. The long- caudal setae are respiratory organs of a kind that is almost if not quite without parallel in the other divisions of Insecta. The dorsal vessel for the circulation of the blood is elongate, and its chambers are arranged one FIG. , Last three abdominal *«. ^ach segment of tllC body. It segments and bases of the three clrives the blood forwards in the iisual caudal processes of Cloeon dip- i j. ii i â i. i feâ¢, dorsal vessel ;M,ostia manner, but the posterior chamber thereof; k, special terminal cham- posSCSSCS three blood-veSSCls, One of ber of the dorsal vessel "with its i . t . -, i ⢠j_ i -\ ^ entrances; J, blood-vessel of the which IS prolonged mto each caudal left caudal process; B, twenty- ggta. This terminal chamber is so sixth joint of the left caudal pro- i i i i i cess from below; b, a portion of arranged as to drive the blood back- the blood-vessel; o, orifice in the -wards into the vessels of the setae ; latter. (After Zinimernianu.) on the under surface ot the vessels there are oval orifices by which the blood escapes into the cavity of the seta so as to be submitted to
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